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.
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:
And of those, the first three are just as applicable to paternity tests as they are to AncestryDNA.
I actually missed the part where anon said they got the test for them and their parents.