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Full Sibling Test*
A full sibling test will determine if two individuals share both parents (full siblings), one parent (half siblings), or do not share any parents (not siblings). If the result is one of half siblings, this test does not determine which parent the two individuals share.
A grandparentage test will tell you if an alleged grandparent is (or is not) the biological grandparent of a tested grandchild. If the result indicates a grandparentage relationship for this test, it cannot determine whether the grandparent is from the mother’s or father’s side of the family.
An aunt/uncle/niece/nephew test will tell you if an alleged aunt/uncle is (or is not) the biological aunt/uncle of a tested niece/nephew. If the result indicates a relationship for this test, it cannot determine whether the aunt/uncle is from the mother’s or father’s side of the family.
First Cousin Test
A first cousin test will tell you if the two people are (or are not) biological first cousins. If the result indicates a cousin relationship for this test, it cannot determine the lineage between the two individuals. *Due to the quantity of DNA that is expected to be in common between individuals, it is not possible to tell between the following relationships with DNA testing:
- Half siblings
As a result, it is important that DNA testing be only a part of the research into your biological family to help support or refute other sources of evidence.
What can I expect my result to say?
The results issued for a relationship test will be either: Exclusion — the two people are NOT likely to be biologically related. Consistent With — the two people ARE likely to be biologically related. Both results will also have the statistical values calculated (and reported) for your particular case that indicate the likelihood of a biological relationship between the two people.
Understanding this test
Every person receives half of their DNA from their mother and half from their father, who in turn received half of their DNA from their mother and half from their father. As such, full siblings will have more DNA in common with one another than half siblings; grandparents and grandchildren will have more DNA in common with one another than distant cousins; etc.