First cousin's grandchild.
by Hgcloziw November 23, 2019
Get the first great-cousin-niblingmug. Second cousin's great-grandchild.
by Gtopql November 23, 2019
Get the second great-great-cousin-niblingmug. 
Get the great-niblingmug. Sibling's great-great-great-grandchild.
My great-great-great-great-nibling is a good person.
by Gtopql November 23, 2019
Get the great-great-great-great-niblingmug. The grandchild-in-law of one's spouse's sibling.
My co-great-nibling-in-law is a good person.
by Elivaldeq November 24, 2019
Get the co-great-nibling-in-lawmug. 
Get the half-great-great-niblingmug.