Does 866 cM shared suggest half aunt rather than aunt?


There is a joke in my family that my father's father is not his biological father. He only has sisters and his father is dead, so there's no possibility of a true test. But I'm his daughter and I did a DNA test, and here's what I got.

I got DNA results back and here's what it says about one of my aunts that tested too. Great aunt or cousin is the link they gave us.

12,2% (866,2‎ cM)
DNA shared
Segments shared
106,2‎ cM
Segment longest

Does that actually mean the joke is true and my aunt is my half aunt?

Emma Levillair

Posted 2019-12-26T09:09:56.963

Reputation: 11

Question was closed 2021-02-17T04:20:42.703



From The Shared cM Project 3.0 tool v4 for 866 cM the possible relationships do not include aunt.

However, they do include half aunt.


Posted 2019-12-26T09:09:56.963

Reputation: 10 741

yes I did use that, so it tends to confirm my aunt is my "half aunt" – Emma Levillair – 2019-12-28T09:28:37.340