If the child or children's parents have a cousin who has a child, that child will be their second cousin. Second cousins share a great-grandparent.

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Cousin Relations
No FicciónThis explains the different relations of cousins, such as first, second, and third cousins, removed cousins, and more!
Second Cousins
If the child or children's parents have a cousin who has a child, that child will be their second cousin. Second cousins share a great-grandparent.