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Paternity Testing on Absent Father

posted by DNA Identifiers @ 3:13 PM
Friday, September 25, 2009

By Kevin Camilleri

DNA testing is one of the most conclusive ways available to determine paternity of any given child. By taking a sample of DNA from both the alleged father and from the child in question, high-tech DNA profiling techniques are used to match reference points across genetic markers on both samples which can lead to an accurate determination of where a genetic relationship exists.

In an ideal world, paternity testing would have available both a sample from the child and from his alleged father in order to best establish the link between them. However, in some DNA paternity testing cases the father is not available to give his DNA sample, whether through choice, or unavailability for some other reason. However, where the father is absent, it is still possible to use other DNA tests to determine whether a relationship exists.

DNA Testing on Other Direct Relatives

By performing DNA testing with other members of the family that share some of the same genes with the alleged father, it is possible to determine whether or not there is a likelihood of paternity over the child in question. Obviously the father’s sample is desired for reasons of accuracy and conclusivity, however it is more than possible (particularly with advancing testing technologies) to be able to determine paternity through shared genetic material through more distant relatives to the father. In other words, provided a relative of the alleged father is available for DNA testing, you should be able to obtain some results although this may not always be conclusive.

DNA Testing on Grandparents

In the absence of the alleged father or any separate sample of his DNA, the alleged paternal grandparents can provide the key to establishing paternity. By taking a sample from either one or both the grandmother and grandfather of the baby, it is possible to determine even in the absence of the father whether or not there is shared genetic material and consequently whether or not there is a shared relationship, i.e. parentage.

DNA Testing on Male Relatives

Y-STR testing is one of the most innovative DNA testing methods honed in recent years, tracking down the male-only Y- chromosome to establish genetic links between male children and elder vertical male relatives, for example grandfathers, great grandfathers, even great uncles by blood relationships. This can be particularly handy where the father is unavailable and direct elderly relatives have died, given that a great deal of genetic material passes unmutated from father to son throughout generations. Of course, this is however absolutely of no use for DNA testing of female children.

DNA Testing on Siblings

Alternatively siblings can also provide a close genetic match, which makes it possible to test whether or not two children are related by the whole blood, rather than half. Where there is dispute over the potential father of a child, an alleged sibling’s sample can be a good way to compare DNA to determine the extent of the relationship. The same can be said for brothers and sisters of the alleged father, who can also share some genetic material sufficient to provide a result in DNA testing of the child in question,

If your situation requires is such that you require to do the DNA testing through one of the alternatives above, it is always advisable to contact in advance the company who will be performing the DNA test and explain your case in full so that they can advise you on the DNA testing options available as well the results that can be obtained.

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38 Responses to “Paternity Testing on Absent Father”

  1. I am the grandmother of 2 little girls,but I dont think they are my sons. May I use my sons father (THE GRANDFATHER) and the 2 little girls to prove if they do belong to my son?
    Thankyou,
    Marsha
    Fulcher

  2. admin says:

    Hello Marsha,

    Yes we can do the test using the grandparents.

    Sincerely,
    Briana

  3. Terri says:

    A woman contacted me claiming that we share the same father (I am female and have three other sisters and one brother). Her mother is alive and available, my mother and father are deceased. Can you determine, with a fair degree of certainty, that we are half-siblings?

  4. admin says:

    Hello Terri,

    We can conduct a sibling test between you and the woman who contacted you.

    Like any lab Siblingship testing is a little more difficult because of the number of genetic combination that are possible between a parent and child. In order to get the most accurate results we recommend that your mother(s) or father(s) or any additional siblings participate in the testing as they provided 50% of each child’s DNA.

    Average results seen with just a two possible siblings type of testing are 78% – please keep in mind that they can be higher or lower depending on the DNA.

    I hope this helps. Please let us know if you have any other questions.

  5. bonnie says:

    MY DAUGHTER PASSED AWAY AND HER TWO KIDS NOW LIVE WITH US AND THE DAD. HE IS HALF PUERTO RICAN DAD, WE ARE WHITE ANYWAY MY GRANDDAUGHTER LOOKS JUST LIKE HER DAD BROWN EYES AND SKIN BUT MY GRANDSON LOOKS JUST LIKE OUR SIDE. REAL WHITE BLUE EYES, IS THERE A WAY I CAN GET A DNA TEST ON HIM WITHOUT MY DAUGHTER? HIS SISTER? AND HIM THAT WOULD AT LEAST PROVE IF THEY ARE HALF SIBILINGS.

  6. admin says:

    Hello Bonnie,

    We have a couple of options for you. We can do a sibling test between your Grandson and Grandaughter.

    Sibling DNA Testing is by far the most difficult test in all of the DNA relationship tests available. This is because, unless siblings are identical twins, they will have been given different sets of DNA from their parents. Sometimes even true full siblings will not match very well, and therefore the test is not very conclusive. When testing two individuals that might only share one parent, the test even more difficult and not nearly as conclusive.

    Each parent gives a child half of her/his DNA. So, when we do a paternity or siblingship test, it is always wise to include the mother since she makes up half of the child’s DNA. We can eliminate that half and test the remaining against the possible father or sibling which gives us a more conclusive result. In the case of siblingship testing, we have to test all of the child’s DNA against all of the other child’s DNA. Including the mothers will tell us which half we do not need to test. Then we compare the remaining DNA to see what the probability of relationship is.

    OR:

    We can do a Paternity Test between the Father and the child in question.

    Non-legal/Private: Cannot be used for any official purpose, for your knowledge only.

    Two options – Self Collection or Professional Collection.

    Self Collection: We can send a package to you for free via 2-day Priority USPS mail (or faster if you pay for shipping). This kit will allow you to swab yourselves in private and includes: Authorization form, swabs, instructions and a (free) pre-paid FedEx Next Day envelope. Also, if you have any questions, you can give us a call anytime and we will provide assistance to you.

    Clinical Collection: Although it is not mandatory to go to a clinic for a private test, some people feel more comfortable having a professional collect the DNA samples. However, it is very easy to perform the DNA collection yourself, we will walk you through it and it will save you money since there is a fee for clinical collections, on top of the DNA testing fee.

    - – - – - – - – - – - – - – - – - – - – - – - – - – - – - – - – - – - – - – - – - – -

    Legally-Binding/Court Admissible: “Legal” testing means that we will check your ID, take your photo and have you sign a chain of custody. In return, you will get a test result that is notarized and can be used for any legal purpose. The test result will never expire and can be used at any point in the future.

    Legal tests are best if you think that you will need the results for ANY legal purpose now or in the future. (Such as birth certificate changes, health insurance, life insurance or death benefits, such as social security, etc.) If males are bringing in children without the mother for a legal test, they must provide a birth certificate or court order showing that they are the legal father/guardian who may sign on behalf of a minor child. It is always best to include the mother in the DNA as her participation greatly increases the accuracy of the test.

    If you would like to schedule the DNA test, please give us the day and time that you would like to attend. We will arrange the appointment for you and send you an email titled “DNA Appointment Confirmation” which will contain all of the information needed for the appointment.

    Please feel free to call, or email us with any questions or concerns.

    Thank you,
    Briana

  7. vicki says:

    I want to know if i can not test the father is it able to be done to find out if my children are full blooded siblings?

  8. admin says:

    Hello Vicki,

    We can test your children to see if they are full siblings or half siblings. We recommend that you participate in the test as well because you will strengthen the results. The reason to include the mother is that each parent gives a child half of her/his DNA. So, when we do a paternity or siblingship test, it is always wise to include the mother since she makes up half of the child’s DNA. We can eliminate that half and test the remaining against the possible father or sibling which gives us a more conclusive result. In the case of siblingship testing, we have to test all of the child’s DNA against all of the other child’s DNA. Including the mothers will tell us which half we do not need to test. Then we compare the remaining DNA to see what the probability of relationship is.

    Please let us know if we can assist you and your family. You can reach us at toll free 888-362-4339.

    Thank you,
    Briana

  9. Connie says:

    Hello – I am interested in learning if my three siblings and I share the same father. (I know the three of them have the same father, I am the only one in question). My father is deceased, my mother is alive. If I request the sibling test, is it best to include samples from all siblings and/or my mother, or is a sample from my brother and I sufficient? Is permission from the subjects required? I would rather not involve my mother if possible but could obtain her DNA.

    Thank you so much.

  10. admin says:

    Sibling Testing:

    Like any lab Siblingship testing is a little more difficult because of the number of genetic combination that are possible between a parent and child. Sibling DNA Testing is by far the most difficult test in all of the DNA relationship tests available at any lab. Unless siblings are identical twins, they will have been given different sets of DNA from their parents. Sometimes even true full siblings will not match very well, and therefore the test is not very conclusive. When testing two individuals that might only share one parent, the test even more difficult and not nearly as conclusive. Each parent gives a child half of her/his DNA, so it is always wise to include the mother since she makes up half of the child’s DNA.

    Non-legal/Private: We can send a package to you for free via 2-day Priority USPS mail (or faster if you pay for shipping). This kit will allow you to swab yourselves in private and includes: Authorization form, swabs, instructions and a (free) pre-paid FedEx Next Day envelope. Also, if you have any questions, you can give us a call anytime and we will provide assistance to you. Regarding a clinical collection – it really is not necessary because it’s very easy to perform the test yourself, but if you would like to go in that direction, we can arrange this for you. There is a fee for clinical collections, on top of the DNA testing fee.

    Test Type:

    Two possible siblings – Average results seen with this type of testing are 82% – please keep in mind that they can be higher or lower depending on the DNA

    Three possible siblings – Average results seen with this type of testing are 89% – please keep in mind that they can be higher or lower depending on the DNA

    Two possible siblings, and Two Mothers – Average results seen with this type of testing are 94.2% – please keep in mind that they can be higher or lower depending on the DNA

    Each time you add a person the results tend to get stronger.

    If it happens that the results are not as strong as you would like, which can occasionally happen, we have extended testing options for you. Please scroll down to “siblings” on this page. http://www.dna-testing-paternity.com/about-us/our-guarantee

    I hope this answers your questions. You can also call us at any time with additional questions about your particular situation.

    Thank you.

  11. Trina says:

    Some months ago I did a sibling dna test with my sister to determine if we were half siblings or full. We knew we shared the same mother, but we were not sure if our father was my father. Our father is 100% Japanese and our mother is white. Out of 4 kids I am the only one with blond hair and blue eyes. So you can understand my suspicions. When I got the results I found them difficult to read. I called the company to have them explain and they said it was nearly impossible for us to be full siblings, I was in a little bit of a shock and forgot to ask some other questions I had. They ran the test through a caucasian database and I was wondering if that would make a difference since we knew my sister is half Japanese. My mother denies the possibility of someone else being my father, and though it does not surprise me that she is I still wonder the possibility that we are full since it was ran through the caucasion database. The results say that it is 1.44 times or 59.017% that we are half versus none, not really sure what that is supposed to mean.

  12. admin says:

    Hello Trina,

    Thank you for your questions. After looking over the information that you sent us it seems likely that your test is just inconclusive. We would recommend adding your mother to the test in order to eliminate the DNA that you and your sister received from her. That would allow the laboratory to focus on the DNA that came from your father. Doing this would provide you with much stronger results. The average results for a test with you, your sister and mother are about 90% for an inclusion, please keep in mind that they can be higher or lower depending on the DNA given to you by your parents. You can also add more siblings to the test to create a more complete picture of your potential father’s DNA.

    Sibling DNA Testing is a helpful tool to resolve family relationships when parents are not available. However, the truth is that it is a complicated test. This is because, unless siblings are identical twins, they will have been given different sets of DNA from their parents. Sometimes even true full siblings will not match very well, and therefore the test is not very conclusive. When testing two individuals that might only share one parent, the test even more difficult and not nearly as conclusive. This is true for DNA testing at any lab.

    Each parent gives a child half of her/his DNA. So, when we do a paternity or sibling test, it is always wise to include the mother since she makes up half of the child’s DNA. We can eliminate that half and test the remaining against the possible father or sibling which gives us a more conclusive result. In the case of sibling testing, we have to test all of the child’s DNA against all of the other child’s DNA. Including the mother(s) will tell us which half we do not need to test. Then we compare the remaining DNA to see what the probability of relationship is.

    I hope this was helpful. It’s pretty complicated and makes sense that you received a DNA test result that was relatively inconclusive. See if your lab can include your mother and what kind of samples they will take in case she is not willing to submit her cheek swabs.

    Best to you. The DNA Identifiers Staff

  13. Auntie of a beautifull bb girl says:

    Yes I was wondering if it is at all possible to find out paternity of my neice through me? My brother is a jerk…and a deadbeat…He is my half brother…we have the same mom diff dad…

  14. admin says:

    Hello,

    YES we can do DNA testing using you and your niece to determine if he is the father. A second option would be to use his parents (your mom and or his dad). That might be a stronger test since you are only half siblings. Below is information about both types of testing. Please let us know if we can be of any more help.

    Avuncular (Aunt or Uncle Test) Testing

    This test can be used to determine if any biological relationship exist between aunts/uncles and nieces/nephews. The cost of the service includes one person and one (alleged family member), but you may add more as needed; for instance a second person or additional Aunt or uncle. This type of testing is referred to as Avuncular DNA analysis.

    When the issue of an avuncular relationship is in question, the recommended method is to test the available parent of the person in question if at all possible. In situations where that person’s parent is unavailable for testing, a DNA avuncular test can still be performed.

    Unlike a DNA paternity test which will always provide a conclusive result, avuncular tests are different. When an avuncular test is conducted, the DNA laboratory will determine the genetic profile of the alleged relatives. Based on the type of genetic material exhibited by each person, an avuncular index is determined. The higher the value of the avuncular index, the greater the likelihood that the two individuals are true biological relatives.

    Grand-Paternity (Grandparentage) Testing

    Grandparentage Testing establishes a Maternal or Paternal relationship. In cases where a suspected Mother or Father are deceased, missing, or unavailable to participate in genetic testing, both of the Paternal or Maternal Grandparents can be tested in order to determine the likelihood of Grandparentage. Two parents of a possible father will make up that male’s DNA, which will, or will not, match that child’s paternal DNA.

    When the Child’s genes do not match the Possible Grandparents’ genes on at least two, or more, different gene sites, the test proves conclusively (it is certain) that the tested Grandparents are NOT the biological Grandparents. In this case, it is presumed that the Possible Father is NOT in fact a biological parent. However, when the Possible Grandparent’s alleles match the alleles of the Child, the probability of Grandparentage is determined.

    Using this advanced technology, the average probability of Grandparentage testing with the child, mother and both paternal grandparents is 99.99%. If you use a smaller number of people in the test the percentage also starts to drop. On average the positive results for a Grandparentage test with just the child and one grandparent is 81%.

    Best Wishes,
    The Staff

  15. bang says:

    CAN I GET A DNA TEST DONE FOR MY DAUGHTER THE FATHER HAS PASSED AWAY BUT HE HIS MOTHER AND OTHER CHILLDREN ARE LIVING.

  16. admin says:

    Hello Bang,

    Yes you can do a DNA test for your daughter. The best option would be to test with the Grandmother and Grandfather. Please call us at 888-DNA-IDFY (362-4339) so that we can assist you further.

    Thank you,
    DNA Identifiers Staff

  17. admin says:

    Hello Bang,

    Yes you can do a DNA test for your daughter. The best option would be to test with the Grandmother and Grandfather. Please call us at 888-DNA-IDFY (362-4339) so that we can assist you further.

    Thank you,
    DNA Identifiers Staff

  18. Jenny says:

    I was wondering if I can find my birth father through my nephew? My dad will not take a test nor my brother but my brothers ex will let me test with my nephew. I have found out that my dad my not be my real father and I don’t know where to start.

  19. admin says:

    Hello Jenny,

    It sounds like your best option would be to do a test to see if you were related to your nephew as his aunt or not related to him. Below is some information on that type of test:

    Avuncular (Aunt or Uncle Test) Testing

    This test can be used to determine if any biological relationship exist between aunts/uncles and nieces/nephews. The cost of the service includes one person and one (alleged family member), but you may add more as needed; for instance a second person or additional Aunt or uncle. This type of testing is referred to as Avuncular DNA analysis.

    When the issue of an avuncular relationship is in question, the recommended method is to test the available parent of the person in question if at all possible. In situations where that person’s parent is unavailable for testing, a DNA avuncular test can still be performed.

    Unlike a DNA paternity test which will always provide a conclusive result, avuncular tests are different. When an avuncular test is conducted, the DNA laboratory will determine the genetic profile of the alleged relatives. Based on the type of genetic material exhibited by each person, an avuncular index is determined. The higher the value of the avuncular index, the greater the likelihood that the two individuals are true biological relatives.

    Each time you add a person the results tend to get stronger. This means that we strongly recommend that your nephew’s mother also participate in the DNA test.

    Please let us know if you have any other questions or would like to schedule an appointment.

    Sincerely,
    DNA Identifiers

  20. Wanda says:

    Can I do a aunt/uncle test if the uncle available is a half brother to my alledged father? My alledged father will not do the test neithe will the other full siblings.

  21. admin says:

    Hello Wanda,

    This test can be used to determine if any biological relationship exist between aunts/uncles and nieces/nephews. The cost of the service includes one person and one (alleged family member), but you may add more as needed; for instance a second person or additional Aunt or uncle. This type of testing is referred to as Avuncular DNA analysis. We can do this testing with half brothers/sisters but it becomes more complicated, because siblings DNA may or may not match closely.

    When the issue of an avuncular relationship is in question, the recommended method is to test the available parent of the person in question if at all possible. In situations where that person’s parent is unavailable for testing, a DNA avuncular test can still be performed.

    Unlike a DNA paternity test which will always provide a conclusive result, avuncular tests are different. When an avuncular test is conducted, the DNA laboratory will determine the genetic profile of the alleged relatives. Based on the type of genetic material exhibited by each person, an avuncular index is determined. The higher the value of the avuncular index, the greater the likelihood that the two individuals are true biological relatives.

    Please call us if you have any questions.

    Regards,
    The Staff at DNA Identifiers

  22. Truncell says:

    hi everybody !!! This is a nice content ! Regards

  23. Tablets says:

    Hey compañero, realmente tenido gusto este poste. Can’ t parece conseguirlo para dar formato a la derecha en Internet Explorer, se dobla todo para arriba, pero no trabaja muy bien en Firefox tan ninguna preocupación.

  24. New York says:

    Good read … headline catchy … good points, some of which I have learned along the way as well (humility, grace, layoff the controversial stuff). Will share with my colleagues at work as we begin blogging from a corporate perspective. Thanks!

  25. louisiana says:

    I was wondering to do a dna test to determine my sons father. if i could get the fathers sister to do the test are only the grandparents, father is refusing to do it and grandfather does not want to do it so sister is my only hope, please advise

  26. admin says:

    Hello Louisiana,

    Yes you can do a DNA testing using the possible father’s sister. This type of test is called an Avuncular Test. Below is more information about this test. Please let us know if you have any questions.

    Avuncular (Aunt or Uncle Test) Testing

    This test can be used to determine if any biological relationship exist between aunts/uncles and nieces/nephews. The cost of the service includes one person and one (alleged family member), but you may add more as needed; for instance a second person or additional Aunt or uncle. This type of testing is referred to as Avuncular DNA analysis.

    When the issue of an avuncular relationship is in question, the recommended method is to test the available parent of the person in question if at all possible. In situations where that person’s parent is unavailable for testing, a DNA avuncular test can still be performed.

    Unlike a DNA paternity test which will always provide a conclusive result, avuncular tests are different. When an avuncular test is conducted, the DNA laboratory will determine the genetic profile of the alleged relatives. Based on the type of genetic material exhibited by each person, an avuncular index is determined. The higher the value of the avuncular index, the greater the likelihood that the two individuals are true biological relatives.

    Best Wishes,
    The Staff at DNA Identifiers

  27. Von says:

    Thanks very good for report, I follow your blog:-)

  28. Angie says:

    I want to know if it is possible to test my X boyfreind brother to see if my son belongs to my X boyfreind? And how accuret is the test and what price ?

  29. admin says:

    Hello Angie,

    Thank you for your question. There are two tests you can do since both your child and the uncle are male. The first is a Y-Chromosome test which will only show if your son belongs to the same male lineage. The second test is called an Avuncular test. That test will give you the probability of relatedness. Below is more information about both tests. For prices, more information or to set up a test please call us at: 888-362-4339.

    Testing the Y-Chromosome

    The Y-chromosome test is useful for males who need to find out whether they are related to another male along the same male lineage. For example, a brother who shares the same father, an uncle who shares your grandfather, or a grandson and his grandfather will have the same Y-chromosome. A male will have the same Y-chromosomes all males which have the same common male ancestor as himself. This test can go back for generations as far back thousands of years and it one method for tracing ancestry.

    Thus, this test is very powerful for determining male progenitor relationships, and it helps to solve the question of whether two males are related along the male line, or if they share the same father.

    – - – - – - – - – - – - – - – - – - – - – - – - – - – - – - – - – - – - – - – - – -

    Avuncular (Aunt or Uncle Test) Testing

    This test can be used to determine if any biological relationship exist between aunts/uncles and nieces/nephews. The cost of the service includes one person and one (alleged family member), but you may add more as needed; for instance a second person or additional Aunt or uncle. This type of testing is referred to as Avuncular DNA analysis.

    When the issue of an avuncular relationship is in question, the recommended method is to test the available parent of the person in question if at all possible. In situations where that person’s parent is unavailable for testing, a DNA avuncular test can still be performed.

    Unlike a DNA paternity test which will always provide a conclusive result, avuncular tests are different. When an avuncular test is conducted, the DNA laboratory will determine the genetic profile of the alleged relatives. Based on the type of genetic material exhibited by each person, an avuncular index is determined. The higher the value of the avuncular index, the greater the likelihood that the two individuals are true biological relatives.

    Reasons to Include the Mom in the DNA Test:
    * Proves that the child matches the mother
    * If the result is a positive, “Yes” it will be twice as strong with the mom included
    * Eliminates the DNA that the child received from the mother.

    Sincerely,
    The Staff at DNA Identifiers

  30. Backlinks says:

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  31. Kinoshita says:

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  32. Kathaleen Arrezola says:

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  33. Mike says:

    I’d love to see a follow up on this.

  34. Gps Signals says:

    This post is good.

  35. jelai says:

    hi i have a friend and has a problem with the paternity test of her child, her husband died a year ago and cremated…
    she said the’y ve done a test w/ the grandparents but the results are not that good,,
    like 50/100% like that,,,so how can we determine the paternity of the child?
    she’a a new friend by the way!!!

  36. admin says:

    Hello Jelai,

    Depending out how the father passed away she should try contacting the Coroners or Medical Examiners Office in the county where he passed and ask them if they have any DNA samples. If they do she can do a DNA test between those samples and the child directly. Otherwise the best most reliable test is going to be one with the grandparents. Below is more information about how that test works.

    Grand-Paternity (Grandparentage) Testing:

    Grandparentage Testing establishes a Maternal or Paternal relationship. In cases where a suspected Mother or Father are deceased, missing, or unavailable to participate in genetic testing, both of the Paternal or Maternal Grandparents can be tested in order to determine the likelihood of Grandparentage. Two parents of a possible father will make up that male’s DNA, which will, or will not, match that child’s paternal DNA.

    When the Child’s genes do not match the Possible Grandparents’ genes on at least two, or more, different gene sites, the test proves conclusively (it is certain) that the tested Grandparents are NOT the biological Grandparents. In this case, it is presumed that the Possible Father is NOT in fact a biological parent. However, when the Possible Grandparent’s alleles match the alleles of the Child, the probability of Grandparentage is determined.

    Using this advanced technology, the average probability of Grandparentage testing with the child, mother and both paternal grandparents is 99.99%. If you use a smaller number of people in the test the percentage also starts to drop. On average the positive results for a Grandparentage test with just the child and one grandparent is 81%.

    I hope this answers your questions. Please let us know if there is anything we can help you with.

    Best Wishes,
    The Staff at DNA Identifiers

  37. Motleyb says:

    Good evening,
    My Blood father just passed away. I never met him and the family was never told about me. I have two half brothers and my bio father has an identical twin. I have no siblings and my mother passed away a decade ago. Will the DNA of my fathers identicle brother provide better results than my possible two half brothers? I am guessing the more the better. Also what would the percentage be.

    Thank you!

  38. admin says:

    Hello Motleyb,

    Thank you for contacting us. The best test will be with your biological father’s identical twin. Identical Twins have the exact same genes because they were conceived/created from the same egg and sperm. We would recommend that you do an avuncular DNA test. This test would compare your DNA to that of your possible uncle to see how closely you match. Because they were identical twins we would expect to see very strong results. There are other testing options as well.

    Avuncular (Aunt or Uncle Test) Testing

    This test can be used to determine if any biological relationship exist between aunts/uncles and nieces/nephews. The cost of the service includes one person and one (alleged family member), but you may add more as needed; for instance a second person or additional Aunt or uncle. This type of testing is referred to as Avuncular DNA analysis.

    When the issue of an avuncular relationship is in question, the recommended method is to test the available parent of the person in question if at all possible. In situations where that person’s parent is unavailable for testing, a DNA avuncular test can still be performed.

    Unlike a DNA paternity test which will always provide a conclusive result, avuncular tests are different. When an avuncular test is conducted, the DNA laboratory will determine the genetic profile of the alleged relatives. Based on the type of genetic material exhibited by each person, an avuncular index is determined. The higher the value of the avuncular index, the greater the likelihood that the two individuals are true biological relatives.

    Testing the Y-Chromosome (only if all parties are male)

    The Y-chromosome test is useful for males who need to find out whether they are related to another male along the same male lineage. For example, a brother who shares the same father, an uncle who shares your grandfather, or a grandson and his grandfather will have the same Y-chromosome. A male will have the same Y-chromosomes all males which have the same common male ancestor as himself. This test can go back for generations as far back thousands of years and it one method for tracing ancestry. Thus, this test is very powerful for determining male progenitor relationships, and it helps to solve the question of whether two males are related along the male line, or if they share the same father.

    Sibling Testing

    Like any lab Siblingship testing is a little more difficult because of the number of genetic combination that are possible between a parent and child. Sibling DNA Testing is by far the most difficult test in all of the DNA relationship tests available at any lab. Unless siblings are identical twins, they will have been given different sets of DNA from their parents. Sometimes even true full siblings will not match very well, and therefore the test is not very conclusive. When testing two individuals that might only share one parent, the test even more difficult and not nearly as conclusive. Each parent gives a child half of her/his DNA, so it is always wise to include the mother since she makes up half of the child’s DNA.

    Again in your situation we would recommended either the Avuncular DNA test or the Y-Chromosome test. Please let us know if we can be of any further assistance.

    Best Wishes,
    The Staff at DNA Identifiers

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