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Do 3rd cousins share the same DNA?

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Do 3rd cousins share the same DNA?

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You are correct that you are 3rd cousins IF your g-g-grandparents are also his g-g-grandparents. Since each person has 16 g-g-grandparents, and that you share 2 of them (because they are paried up in 8 husband-wife couples), then you share 1/8th of the same DNA.

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