Blaine Bettinger, writing in his Blog The Genetic Genealogist, asks the question whether second cousins (or closer) might NOT share any DNA. He takes us through the logic of how unlikely that event would be, and the conditions that have to be met for it to be proven true.
This is a good article to read to sharpen you DNA analytical skills.
Second Cousins (Or Closer) That Don’t Share DNA? – The Genetic Genealogist:
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