What is a fourth cousin?

Answer

Fourth cousins share the same great-great-great-grandparents. In other words, one great-grandparent and another person's great-grandparent were cousins. Also, one great-great grandparent and another person's great-great grandparent were siblings.

Usually very little DNA is shared at this level of kinship. Fourth cousins only share about 0.4 percent of identical DNA, compared to 25 percent for first cousins. Cousins can also be "removed" when they are from separate generations. For example, once you have a child, your fourth cousin will be your child's fourth cousin once removed. On the other hand, your child and your fourth cousin's child would be fifth cousins.

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