half-pibling-in-law Share definition Flag 1. The spouse of one's parent's half-sibling. 2. The half-sibling of one's parent-in-law. My half-pibling-in-law is a good person. half-pibling-in-law by Elivaldeq November 24, 2019 0 0 Get merch Get the half-pibling-in-law mug. Buy Now — $32.95 See more merch