double-first-cousin

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

Double-first-cousin.

double-first cousin-niece

Daughter of their maternal first cousin with the paternal first cousin or double-first cousin’s daughter.

My double-first cousin-niece is a good person.

first great-cousin-nephew

First cousin's grandson.

My first great-cousin-nephew is a good boy.

first cousin-pibling

Parent's first cousin.

My first cousin-pibling is a good person.

step-first-cousin-twice-removed

1- Stepgrandparent's cousin.
2- Grandparent's stepcousin.
3- Stepcousin's granchild.
4- Cousin's stepgrandchild.

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

step-first-cousin-twice-removed

1- Stepgrandparent's first-cousin.
2- Grandparent's step-first-cousin.
3- Step-first-cousin's granchild.
4- First-cousin's stepgrandchild.
5- Step-1C2R.

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

first cousin-nibling

First cousin's child.

My first cousin-nibling is a good person.