I have an 855 cM match with a mystery 1st-2nd cousin. My cousin has an 1,147 cM match to the same mystery cousin.
Is it possible the 1,147 cM match could be a half sibling?
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According to DNAPainter, the range for half-siblings is 1160-2436cM. So I would be doubtful that an 1147cM would be a half-sibling.