Her parents, John Rooney and his wife Sarah Tracy, were "double" first-cousins, his parents being si…

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Her parents, John Rooney and his wife Sarah Tracy, were "double" first-cousins, his parents being siblings to her parents. Thus, they share d 25% of their DNA, rather than the 12.5% they would share if they were only "single" first cousins. It's the equivalent of marrying your half-sibling.

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140 3 68 71 Sunday, March 26, 2023 11:08 AM
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