Double-3C:
Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and four great-great-grandparents in common.
My double-third-cousin is a good person.
by Gerald128 May 17, 2021
Third-cousin-nine-times-removed (3C9R).
My third-cousin-9X-removed is a good person.
by N8953SW June 27, 2021
1- Great-great-great-grandparent's sibling's great-grandchild / Grandparent's third-cousin.
2- Great-grandparent's sibling's great-great-great-grandchild / Third-cousin's grandchild.
My third-cousin-twice-removed is a good person.
by ZJO8738 October 3, 2021