Bosustow has two sons. Nick, with whom he formed a production company, is now a recruiter for the Peace Corps after serving as a volunteer in Guatemala and Suriname. His other son, Tee, has been working on a documentary focusing on his late father's animation studio, titled "UPA: Magoo, McBoing Boing, and Modern Art”. He documents the film's progress at the UPA Legacy Project site. Tee also hosts the animation podcast site, Toon In! ... to the World of Animation! with interviews from all around the world, featuring animation artists from UPA and other studios, as well as independent animators and historians.