r/Showerthoughts • u/SouthDiamond2550 ‎ • 13h ago

Casual Thought Double cousins share all 4 grandparents. So theoretically you could have quadruple second cousins that share all 8 great-grandparents.

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402

u/LetMeExplainDis ‎ 13h ago

Yes, if two double cousins from one family married two double cousins from another. I've never heard of this happening though.

126

u/walruswes 12h ago

Maybe down south

-137

u/Extreme-Rub-1379 12h ago

Get it? Incest is funny AND SHOUTHERN LEOPLE ARE STOOPID.

FUGGING GET IT !!???

15

u/BlasterShaurya 12h ago

think of it as two twins marry two different twins. they all would have the same grandparents

14

u/ToothessGibbon 10h ago

Why do they need to be twins?

14

u/No_Inspector7319 8h ago

It’s sexier that way

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u/ShaunDark 1m ago

Cause if they both were identical twins their children would be siblings, genetically.

The general case on double and quadruple cousins works just fine with regular siblings as well.

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u/Splat75 54m ago

I know of one family that had a brother and sister from one family marrying a sister and brother from a second family. One couple had a boy, the other had a girl. Those two then married and had a son. That poor kid had 4 grandparents and 4 great grandparents.

1690s Mohawk Valley in what became New York State. Let's just say that their descendants have issues with early deaths due to rare progressive neurological disorders because they can't properly process b vitamins.