First cousin's great-great-grandchild.
My first great-great-great-cousin-nibling is a good person.
1- Step-second-cousin's spouse.
2- Spouse's step-second-cousin.
step-second-cousin-in-law.
My sesqui-first cousin-nephew is a good boy.
Someone who, in relation to others, has zero parents, zero grandparents, zero great-grandparents, zero great-great-grandparents and nine great-great-great-grandparents in common.
Irregular-quintuple-fourth-cousin.
Someone who, in relation to others, has zero parents, zero grandparents, zero great-grandparents, zero great-great-grandparents and six great-great-great-grandparents in common.
Triple-4C: Person who, in relation to the other person, has zero parents, zero grandparents, zero great-grandparents, zero great-great-grandparents and six great-great-great-grandparents in common.
My triple-fourth-cousin is a good person.
Third-cousin-five-times-removed (3C5R).
My third-cousin-5X-removed is a good person.