AncestryDNA would absolutely give conclusive proof of either close blood relationship or lack thereof. In practice, it’s just as good as a paternity test.
The only caveats I can think of are:
- Both parent and (potential) child would have to get the test.
- I guess if AncestryDNA just completely messed up and represented some random other person’s DNA as the parent’s or child’s, that would give false negatives.
- Chimerism.
- AncestryDNA might not be admissable in court.
And of those, the first three are just as applicable to paternity tests as they are to AncestryDNA.
SkunkWorkz@lemmy.world 1 week ago
If the bio dad also did the test then Ancestry will match it with this kid. And even if the bio dad isn’t on there if you find out via the tests that you have close relatives like first cousins, uncles, aunts that you never knew you had, you can put two and two together and come to the same conclusion.