half-great-cousin-aunt

Grandparent’s female half-first cousin.

My half-great-cousin-aunt is a good person.

third-cousin-in-law

1- Third-cousin's spouse.
2- Spouse's third-cousin.
3- 3C-in-law.

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

southern cousins

when two people say they're like family yet they actually get weird behind the scenes
like, for instance, cousins from the South

you two may say you're like brother and sister, but you're really some southern cousins.

second-cousin-3X-removed

Second-cousin-thrice-removed (2C3R).

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

ninth-cousin-7X-removed

Ninth-cousin-seven-times-removed (9C7R).

My ninth-cousin-7X-removed is a good person.

first step-cousin-nephew

1. The granddaughter of one's parent's stepsibling.
2. The stepgranddaughter of one's parent's sibling.
3. The granddaughter of one's stepparent's sibling.

My first step-cousin-nephew 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.