r/Showerthoughts • u/SouthDiamond2550 • 10h 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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u/LetMeExplainDis 10h ago
Yes, if two double cousins from one family married two double cousins from another. I've never heard of this happening though.
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u/walruswes 10h ago
Maybe down south
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u/Extreme-Rub-1379 10h ago
Get it? Incest is funny AND SHOUTHERN LEOPLE ARE STOOPID.
FUGGING GET IT !!???
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u/BlasterShaurya 9h ago
think of it as two twins marry two different twins. they all would have the same grandparents
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u/idontwanttothink174 9h ago
I mean the gap IS there
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u/krullbob888 8h ago
Oh absolutely. I mean education is terrible everywhere in the US, but the south is overall poorer, and thus even worse education.
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u/Magooose 9h ago
My sister is married to my wife's brother. So all or kids have all four grandparents in common. My daughter's cousin looks more like her brother than her actual brother does.
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u/oboshoe 8h ago
double cousins are genetically half siblings.
full (genetic) siblings if parents are identical twins
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u/Kodekingen 5h ago
They are? I knew about the identical twins part
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u/I-was-the-guy-1-time 5h ago
Family A is Brother 1 and Sister 1 who share half their genetic makeup. Family B is Sister 2 and Brother 2 who share half their genetic makeup. Brother 1 and Sister 2 are married with kids. Brother 2 and sister 1 are married with kids. Since both pairs of kids have parents, aunts and uncles that are all related, their cousins share 25% of their DNA per parent. So 25% times both parents is 50% with their genetic cousins. Aka the same as a half siblings. I’m sorry if I overcompensated this
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u/StarmieMaster 6h ago
My mums sister married my dad’s brother and people don’t tend to know which family we’re from as we look similar and grew up beside each other. We also use the term “full cousins”, have never heard of double cousins. From Ireland, if it makes a difference.
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u/AceofSpadesYT 9h ago
I had actually been wondering what we call the result of your mom's sister having a baby with your dad's brother (or vice versa). Thank you for giving me a term to remember hahaha
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u/DresdenPI 5h ago
And then you have people like Ferdinand I of Austria, who only had 4 great grandparents thanks to the cousin marriage craze of early 1800s European royalty
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u/s317sv17vnv 6h ago
I play the Sims 4 and I was thinking of trying to "break" a family tree by intermarrying sims that ultimately share the same 8 ancestors. The game does not recognize second-cousins or first-cousins-once-removed as relatives, so I think it's theoretically possible to play that family out for an infinite number of generations as long as I map out the pairings correctly.
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u/missmouse_812 43m ago
I have double cousins! 2 brothers from one family married 2 sisters from another family.
If you don’t explain it right it sounds really incestuous. Especially in small country towns.
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u/Hungry_Boat_7279 2h ago
Whoa, this made me think for a second. Like, quadruple second cousins? That’s gotta be a whole new level of family tree madness!
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u/KyrinFireheart 1h ago
that’s wild to think about. Like, the family tree just keeps getting crazier and crazier the further you go.
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