1- Grandparent's third-cousin.
2- Third-cousin's grandchild.
third-cousin-twice-removed.
Grandparent's male third cousin.
My third great-cousin-uncle is a good person.
Someone who, in relation to others, has zero parents, zero grandparents, zero great-grandparents and twelve great-great-grandparents in common.
Sextuple-3C:
Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and twelve great-great-grandparents in common.
My sextuple-third-cousin is a good person.
Living being that has zero parents, zero grandparents, zero great-grandparents and twelve great-great-grandparents in common with other living beings.
sextuple-third-cousin.
1- Third-cousin's spouse.
2- Spouse's third-cousin.
3- 3C-in-law.
My third-cousin-in-law is a good person.