first great-great-great-cousin-nephew

First cousin's great-great-grandson.

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

nephew cousin

When your aunt is your cousin and her son can't possibly be the same level on the family tree

Jordan: Zach can't be our cousin if ayu is our cousin. He's our nephew cousin. Duh

Vanessa: well that makes sense. I'm so stupid.

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father's brother's nephew's cousin's former roommate

Someone whom you have no relation to in genealogy. A joke in the movie Spaceballs

"I am your father's brother's nephew's cousin's former roommate"
"And that makes us?"
"Absolutely nothing! Which you are about to become!"
(Quote from Spaceballs)

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second great-great-cousin-nephew

Second cousin's great-grandson.

My second great-great-cousin-nephew is a good person.

first co-cousin-nephew-in-law

The grandson-in-law of one's parent-in-law's sibling.

My first co-cousin-nephew-in-law is a good person.

double-first great-cousin-nephew

Son of their maternal first cousin’s child with the paternal first cousin’s child or double-first cousin’s grandson.

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

half-first great-cousin-nephew

Half-first cousin’s grandson.

My half-first great-cousin-nephew is a good person.