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.

double-first great-cousin-nephew by Hgcloziw November 23, 2019

half-first great-cousin-nephew 

Half-first cousin’s grandson.

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

half-first great-cousin-nephew by Gtopql November 23, 2019