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Pardon me for my ignorance, but wouldn't sons of first cousins be second cousins?
Language quirk :) The son of my first cousin is my first cousin once removed. My son and my cousin's son are second cousins.
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Really not an issue with second cousins. Second cousins are genetically different enough that issues with the children are just barely more common in non-related couples.
Yep. That's the kind of thing you look up at a young age when you discover you're the recent product of second cousins. Some interesting quotes from the "Cousin Marriage" Wikipedia article: "According to Professor Robin Fox of Rutgers University, it is likely that 80% of all marriages in history may have been between second cousins or closer." "Worldwide, more than 10% of marriages is between first and second cousins…
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Yep. That's the kind of thing you look up at a young age when you discover you're the recent product of second cousins. Some interesting quotes from the "Cousin Marriage" Wikipedia article: "According to Professor Robin Fox of Rutgers University, it is likely that 80% of all marriages in history may have been between second cousins or closer." "Worldwide, more than 10% of marriages is between first and second cousins…
Einsten, Darwin, and Giuliani all married their first cousins, from what I understand.
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I get mad at people who think sons of first-cousins are second-cousins all the time -- and, frankly, almost everyone I know think this way. I'm glad you linked to this Wikipedia article that proves I'm not mad into thinking there is a simple logic pattern that can be applied to cousinship. However, this "once removed" notation is crazy. Why not second-uncle for parents of second-cousins and so on?
That's what I use. 2nd uncle, 2nd grand aunt Fun fact: in Russian a first cousin is a 2nd Brother/Sister, a 2nd cousin is a 3rd Brother/Sister and so on.
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I've always wondered about this one: My father's first-cousin-once-removed is what to me?
I think, if your father's cousin-once-removed is a generation below him, then he/she is your first-cousin. While a generate above you father would signal first-cousin-twice-removed... Thoughts?
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Yep. That's the kind of thing you look up at a young age when you discover you're the recent product of second cousins. Some interesting quotes from the "Cousin Marriage" Wikipedia article: "According to Professor Robin Fox of Rutgers University, it is likely that 80% of all marriages in history may have been between second cousins or closer." "Worldwide, more than 10% of marriages is between first and second cousins…
Einsten, Darwin, and Giuliani all married their first cousins, from what I understand.
the current title has implications not yet rigorously tested and people is already looking into selection bias to explain correlation where probably there's none.
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They explicitly call this out and apply population stratification later in the paper.
Yeah, which means the extensibility of these claims is exactly as good as those corrections, which can't possibly hope to model the missing information (the actual genetic distribution of friends).
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> second cousins Didn't stop my great grandparents :) My mom's side is Mennonite, which is also a very tight knit community. When my grandma sends random pictures from in and around Goshen, Indiana, my wife has commented multiple times "whoa that guy in the background really looks like you!"
Really not an issue with second cousins. Second cousins are genetically different enough that issues with the children are just barely more common in non-related couples.
If marrying your first cousin is a culturally accepted practice, it happens all the time and people get much more inbred than you might expect from looking at, or calculating from, a stylized 8-person cousin marriage family tree. And that goes for second-cousin marriages too, to a lesser degree.