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.
Third-cousin-five-times-removed (3C5R).
My third-cousin-5X-removed is a good person.
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.
Someone who, in relation to others, has zero parents, zero grandparents, zero great-grandparents and sixteen great-great-grandparents in common.
Octuple-3C:
Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and sixteen great-great-grandparents in common.
My octuple-third-cousin is a good person.
Living being that has zero parents, zero grandparents, zero great-grandparents and sixteen great-great-grandparents in common with other living beings.
octuple-third-cousin.
1- Spouse's third-cousin's spouse.
2- Co-3C-in-law.
My co-third-cousin-in-law is a good person.