stepdad-to-be Share definition Flag The fiancé of one's mom. When they marry, he will become your stepdad. Jane's mom's new boyfriend, John, proposed last night. John is Jane's stepdad-to-be. stepdad-to-be by Disvan September 26, 2010 0 0 Get merch Get the stepdad-to-be mug. Buy Now — $32.95 See more merch
