first cousin-in-law

First cousin's spouse or spouse's first cousin.

My first cousin-in-law is a educated person.

first-cousin-in-law

1- First-cousin's spouse.
2- Spouse's first-cousin.
3- Cousin-in-law.

My first-cousin-in-law is a good person.

third-cousin-3X-removed

Third-cousin-thrice-removed (3C3R).

My third-cousin-3X-removed is a good person.

seventh-cousin-8X-removed

Seventh-cousin-eight-times-removed (7C8R).

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

irregular-double-first-cousin

1- Child of uncle (father's brother) and of half-aunt (mother's half-sister) at the same time.
2- Child of uncle (mother's brother) and of half-aunt (father's half-sister) at the same time.
3- Child of aunt (father's sister) and of half-uncle (mother's half-brother) at the same time.
4- Child of aunt (mother's sister) and of half-uncle (father's half-brother) at the same time.
5- Someone who, in relation to others, has zero parents and three grandparents in common.

Irregular-double-first-cousin.

Butthole cousins

The gay version of "wiener cousins". When multiple men have experienced the same butthole.

John and Brian are butthole cousins after they both dated Sean.

great-great-cousin-nibling

First cousin's great-grandchild.

My great-great-cousin-nibling is a good person.