Half-sibling's great-granddaughter.
My half-great-great-niece is a good person.
by Gtopql November 23, 2019
Get the half-great-great-niecemug. 
Get the great-niecemug. 
Get the half-great-great-niecemug. My half-first great-cousin-niece is a good person.
by Gtopql November 23, 2019
Get the half-first great-cousin-niecemug. The granddaughter-in-law of one's spouse's sibling.
My co-great-niece-in-law is a good person.
by Elivaldeq November 24, 2019
Get the co-great-niece-in-lawmug. 
Get the half-great-great-great-niecemug. 