Recently we (two full sisters and a full brother) think we may have found a half brother who is 50 years old on Ancestry DNA, where he is being categorized as Close Family-First Cousin.
- sister 52yr share 1,902 cM over 60 seg 100% match
- sister 51yr share 1,833 cM over 61 seg 100% match
- brother 50yr share 1,316 cM over 50 seg 68% match
Each of the above can be g-parent, g-child, uncle, nephew, 1/2 sibling.
Also a ****nephew 14yr share 975 cM over 36 seg 99% match**** can be 1st cousin, gg-parent, gg-cousin, great uncle, grand nephew, 1/2 nephew, 1/2 uncle
Given these results is he my half sibling?
I ask because his biological mother is saying our father (deceased would have been 79) is not his biological father.
I really do not know much about all this DNA but I think the answer is simple and I just want confirmation from a reliable source.