irregular-nonuple-fourth-cousin

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

Irregular-nonuple-fourth-cousin.

sesqui-cousin-nephew

Sesqui-first cousin’s son.

My sesqui-cousin-nephew is a good boy.

first cousin-nibling

First cousin's child.

My first cousin-nibling is a good person.

sesqui-great-cousin-niece

Sesqui-first cousin’s granddaughter.

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

step-cousin-niece

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 step-cousin-niece is a good person.

ninth-cousin-6X-removed

Ninth-cousin-six-times-removed (9C6R).

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

sesqui-cousin-niece

Sesqui-first cousin’s daughter.

My sesqui-cousin-niece is a good person.