1- Third-cousin's spouse.
2- Spouse's third-cousin.
3- 3C-in-law.
My third-cousin-in-law is a good person.
by User655 July 26, 2021
Third-cousin-thrice-removed (3C3R).
My third-cousin-3X-removed is a good person.
by N8953SW June 27, 2021
Sester-3C:
Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and five great-great-grandparents in common.
My sester-third-cousin is a good person.
by Gerald128 May 15, 2021
Sesquaple-3C: Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and seven great-great-grandparents in common.
My sesquaple-third-cousin is a good person.
by ZYRB3256 February 21, 2022