Is SB my birth father, perhaps?
SB is deceased. His son JB also is deceased. His child JB Jr. has a 723 cM,10% connection to me. Great Grand Son, JB II has a 361cM, 5% connection to me. Is it likely that SB is my birth father?
I find this quite confusing. Thanks.
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If SB is your father, then JB would be your Half Sibling, JB Jr would be your Half Nephew, and JB II would be your Half Great Nephew. According to this centimorgan chart, this is a good possibility. However, "possible" does not necessarily mean "certain."
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There is a good reference book called "The Family Tree: Guide to DNA Testing and Genetic Genealogy" by Blaine T Bettinger ISBN 978144034532. It explains a lot about calculating relationships using DNA matches.
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You can also use the DNA Painter WATO tool. By building a tree of other DNA matches on this side of your family, along with hypothetical relationships, you can see what hypothetical relationships are statistically possible and which is most likely.
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