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