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

Thank you!

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

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.

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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