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Sep 3, 2019 at 0:53 comment added RonJohn @nnnnnn I only learned the cousin rules when I got into genealogy. First cousins share a pair of grandparents. Second cousins share a pair of great-grandparents, etc, etc.
May 21, 2016 at 0:24 comment added nnnnnn The nth cousin convention is actually pretty easy to understand and memorise, as is the n times removed thing. I think the reason many people don't worry about that stuff is that by the time you get to "third cousins" the nearest common ancestor linking the two is likely deceased. And (assuming no inbreeding) any two third cousins have seven pairs of great great grandparents that are not common between them.
May 21, 2016 at 0:03 vote accept JoAnn
May 20, 2016 at 23:49 history answered Catija CC BY-SA 3.0