sesqui-first-cousin

1- Child of parent’s full sister and of other parent’s half-brother at the same time.
2- Child of parent’s full brother and of other parent’s half-sister at the same time.
3- Person who, in relation to the other person, has zero parents and three grandparents in common.
4- Sesqui-cousin.
5- Sesqui-1C.

My sesqui-first-cousin is a good person.

sesqui-first-cousin

Sesqui-cousin or sesqui-1C:
1- Child of their parent’s full sibling with the other parent’s half-sibling.
2- Person who, in relation to the other person, has zero parents and three grandparents in common.

My sesqui-first-cousin is a good person.

sesqui-first cousin

Child of their parent’s half-sibling with the other parent’s full sibling.

My sesqui-first cousin is a good person.

half-cousin-nephew

Half-first cousin's son.

My half-cousin-nephew is a good person.

double-first great-cousin-pibling

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

My double-first great-cousin-pibling is a good person.

half-great-cousin-uncle

Grandparent’s male half-first cousin.

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

Baby cousin

Your sister or brother's child, who exists as one of the 11 recognized genders, but you can't really be bothered to think too much about it, so yeah; baby cousin.

Yeah, you know Ronnie's friend AJ? Her man's...... Baby cousin