Someone who, in relation to others, has zero parents, zero grandparents, zero great-grandparents and ten great-great-grandparents in common.
Living being that has zero parents, zero grandparents, zero great-grandparents and ten great-great-grandparents in common with other living beings.
quintuple-third-cousin.
Third-cousin-eight-times-removed (3C8R).
My third-cousin-8X-removed is a good person.
Third-cousin-once-removed (3C1R).
My third-cousin-1X-removed is a good person.
Sesqui-3C:
Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents and three great-great-grandparents in common.
My sesqui-third-cousin is a good person.
1- Grandparent's third-cousin.
2- Third-cousin's grandchild.
My third-cousin-twice-removed is a good person.
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.