A first cousin that shares one grandparent instead of both grandparents like a regular first cousin.
My grandpa isn’t related to me, but my grandma is meaning that my first cousins are my half cousins.
by Excrushman November 8, 2020
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Half-3C:
1- Parent's half-second-cousin's child.
2- Grandparent's half-first-cousin's grandchild.
3- Great-grandparent's half-sibling's great-grandchild.
4- Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and one great-great-grandparent in common.
My half-third-cousin is a good person.
by Gerald128 May 17, 2021
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