what is the difference between 2nd cousin and 1st cousin once removed
In: Biology
Count the number of generations back to the first common ancestor for both “cousin.” Use the shorter distance to figure first-second-third. Same great grandparent, second cousin. Same grandparent, first cousin. Same parent, well, that’s your sibling (zeroeth cousin?).
If it’s a different number of generations on each side, the difference is the number of times removed.
Abe’s great grandparent is Betty’s grandparent, they’re first cousins once removed.
Charlie’s great grandparent is Dottie’s great great grandparent, they’re second cousins once removed.
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