step-great-niece Share definition Flag 1. The granddaughter of one's stepsibling. 2. The stepgranddaughter of one's sibling. My step-great-niece is a good person. step-great-niece by Elivaldeq November 24, 2019 0 0 Get merch Get the step-great-niece mug. Buy Now — $32.95 See more merch
