octuple-third-cousin

Living being that has zero parents, zero grandparents, zero great-grandparents and sixteen great-great-grandparents in common with other living beings.

octuple-third-cousin.

co-third-cousin-in-law

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

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

step-cousin-aunt

1. The daughter of one's grandparent's stepsibling.
2. The stepdaughter of one's grandparent's sibling.
3. The daughter of one's stepgrandparent's sibling.

My step-cousin-aunt is a good person.

second-cousin-6X-removed

Second-cousin-six-times-removed (2C6R).

My second-cousin-6X-removed is a good person.

first cousin-nephew

First cousin's son.

My first cousin-nephew is a good boy.

irregular-octuple-fourth-cousin

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

Irregular-octuple-fourth-cousin.

sesqui-first great-cousin-niece

Sesqui-first cousin’s granddaughter.

My sesqui-first great-cousin-niece is a good person.