Second cousin's great-grandchild.
My second great-great-cousin-nibling is a good person.
Half-first cousin’s grandchild.
My half-first great-cousin-nibling is a good person.
First cousin's great-grandchild.
My first great-great-cousin-nibling is a good person.
The grandchild-in-law of one's spouse's sibling.
My co-great-nibling-in-law is a good person.