First cousins share a grandparent (2 generations) Second cousins share a great-grandparent (3 generations) Third cousins share a great-great-grandparent (4 generations) Fourth cousins share a 3rd-great grandparent (5 generations)

What is the relationship between third cousins?

What is the meaning of third cousin? Your third cousin is the child of your parents second cousin and share great-great grandparents as their most recent common ancestor. The parents of third cousins are related, too. Your parent and your third cousins parent are second cousins.

Can you date your 3rd cousin?

Is it okay to date your third cousin? Since third cousins share only a very small percentage of their DNA, there is no issue with third cousins dating from a genetic perspective. According to an article by The Spruce, marriage between second cousins and more distant cousins is legal throughout the United States.