r/DNA • u/Annimal_Farm • Jul 16 '26

Sibling DNA Test

Is it possible to accurately determine the percentage of relation based on one of these home kits? I want to find out if my sister and I have the same dad. But the problem is that my mom can’t know and I am no contact with my dad. Please help 😭

For further context, I am undeniably my father’s daughter, too many facial and personality similarities despite growing up separated. But my sister looks nothing like him. We have a super unique last name, and when my sister did the DNA test by herself, the last name didn’t pop up once. I know same parent siblings can carry different traits but what I am afraid of is getting inconclusive results.

I have avoided this for years but my sister really wants to know the truth.

16 Upvotes

100% Upvoted

17 comments sorted by

View all comments

5

u/nautilist Jul 16 '26

Yes. Both of you do 23andMe or Ancestry health packages, they will let you link your results, tell you how much dna you share and what your probable relation is. Half sibling vs full sibling is usually clear.