0

My half sister (Maternal) share 1673cM across 50 segments. Cousin #1 to me shares 994cM across 40 segments. Cousin #1 shares 1056cM across 46 segments. Her maybe father is my mothers brother. All of my other Cousin's on Maternal side are in the 700-800cM range.This is odd as there has been rumors for decades that Cousin #1 and my half sister share the same father. My mom and Cousin #1's mom (no blood relation) may have been impregnated by the same man. If they are half siblings would Cousin #2 and I share any DNA or are we all just 1st Cousins

Improve this question
1
  • You say, "Cousin #1 to me shares 994cM across 40 segments. Cousin #1 shares 1056cM across 46 segments." Is the second Cousin #1 supposed to be Cousin #2, who is mentioned in the last sentence?
    – shoover
    Commented Mar 22, 2023 at 5:10

1 Answer 1

Reset to default
0

According to DNA Painter, 1673 cM is a half-sibling relationship, which you seem certain about anyway. All other relationships described fall within the shared cM range for 1st cousins (396 - 1397), including 1056 cM, which is what I think the amount shared between your half-sister and Cousin #1 is (not clear from original post). 994 cM is also well within the range for 1st cousins, and both preclude any half-sibling relationship between yourself or your half-sister and Cousin #1 (or #2? - again not clear from your post). You are all 'just' cousins.

Your other maternal cousins in the 700-800 shared cM range with yourself are still more likely to be whole 1st cousins, but half 1st cousin relationships cannot be ruled out.

Improve this answer

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.