Hernangómez's immediate family is made up of former or current basketball players. His older brother, Willy, currently plays for the New Orleans Pelicans, having previously played for Real Madrid. His mother, Margarita Geuer Draeger was an international basketball player, winning a European championship with Spain in 1993. His father also played for Real Madrid and Estudiantes, and his younger sister currently plays for Estudiantes' youth team.