If the child or children have a second cousin who has a child, that child will be their third cousin. Third cousins share a great-great-grandparent.

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Cousin Relations
Non-FictionThis explains the different relations of cousins, such as first, second, and third cousins, removed cousins, and more!
Third Cousins
If the child or children have a second cousin who has a child, that child will be their third cousin. Third cousins share a great-great-grandparent.