Someone who, in relation to others, has zero parents, zero grandparents, zero great-grandparents, zero great-great-grandparents and seven great-great-great-grandparents in common.
Irregular-quadruple-fourth-cousin.
My half-first great-cousin-nephew is a good person.
Child of their maternal first cousin’s child with the paternal first cousin’s child or double-first cousin’s grandchild.
My double-first great-cousin-nibling is a good person.
Seventh-cousin-six-times-removed (7C6R).
My seventh-cousin-6X-removed is a good person.
Someone who, in relation to others, has zero parents, zero grandparents and three great-grandparents in common.
Irregular-double-second-cousin.