Cousins
Typically, with 2nd cousins we have we have 2 common great grandparents. Then 4 common great great grandparents.
If we have 2 common great great grandparents it will be 3rd cousins.
In my ancestors I’ve got a situation where I don’t have common great grandparents but there are a brother and sister who married a sister and brother. So like the 2nd cousin scenario there are 4 common great great grandparents.
My suggestion; If we have 4 common great great grandparents then we are 2nd cousins.
Comments
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Sorry - we don't get to make the rules of the English language. As far as I understand it, if a brother and sister marry a sister and brother, then the term - if there is one - is double cousins. The backtracking to the first set of common ancestors (direct ancestors, to be explicit!) tells us how many greats there are. If I understand your example, then the first pair of common ancestors are great-great-grandparents. Therefore you are (double) third cousins. (Count the "G"s is what I do).
It doesn't matter how many sets of common ancestors on that generation you have - at least, not for the terminology. I'm sure it does for DNA purposes.
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