Can someone tell me if siblings dna is 100% can they have same father but different mothers. :: FamilyTreeCircles.com Genealogy
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Can someone tell me if siblings dna is 100% can they have same father but different mothers.

Question by Mumsie20

In this instance mothers are sisters?

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by Mumsie20 Profile | Research | Contact | Subscribe | Block this user
on 2021-08-08 04:11:38

Mumsie20 has been a Family Tree Circles member since Feb 2020.

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Answers

by KableWalker on 2021-08-18 03:49:41

The DNA of siblings (brothers AND sisters) can never be more than half identical as around 50% comes from each parent- so they could share between 37.5 and 51% of their DNA. They should share less than 49% if their mothers were sisters but then they'd be cousins (who share an average of 12.5% when their mothers are NOT related), not siblings). Have a look on some genealogy sites to find the approximate percentages of DNA people can have in common for a range of relationships. Plus, remember that percentages are just a rough guide and in real life there can be quite a wide range of DNA shared.

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