first great-cousin-niece

First cousin's granddaughter.

My first great-cousin-niece is a good girl.

third cousin-nibling

Third cousin's child.

My third cousin-nibling is a good person.

first-cousin-8X-removed

First-cousin-eight-times-removed (1C8R).

My first-cousin-8X-removed is a good person.

irregular-sexdecuple-fourth-cousin

Someone who, in relation to others, has zero parents, zero grandparents, zero great-grandparents, zero great-great-grandparents and thirty-one great-great-great-grandparents in common.

Irregular-sexdecuple-fourth-cousin.

fifth-cousin-9X-removed

Fifth-cousin-nine-times-removed (5C9R).

My fifth-cousin-9X-removed is a good person.

sesqui-great-cousin-uncle

Son of their great-grandparent’s half-sibling with the other great-grandparent’s full sibling.

My sesqui-great-cousin-uncle is a good person.

double-first-cousin-twice-removed

1- Child of their parent’s grandpibling with the other parent’s grandpibling.
2- Child of their parent’s grandnibling with the other parent’s grandnibling.
3- Child of their parent’s grandpibling with the other parent’s grandnibling.
4- Grandparent's double-first-cousin.
5- Double-first-cousin's grandchild.

My double-first-cousin-twice-removed is a good person.