Third cousin's grandchild.
by Gtopql November 23, 2019
Get the third great-cousin-niblingmug. 
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.
by Hgcloziw November 23, 2019
Get the double-first great-cousin-niblingmug. Spouse's nibling's spouse.
My nibling-by-marriage-in-law is a good person.
by NSBC968755 February 25, 2023
Get the nibling-by-marriage-in-lawmug. The grandchild-in-law of one's parent-in-law's sibling.
My co-cousin-nibling-in-law is a good person.
by Elivaldeq November 24, 2019
Get the co-cousin-nibling-in-lawmug. by Niblet February 27, 2018
Get the niblemug.