Movies ¦ Entertainment ¦ Rich Movies on Instagram: "Why'd bro start drinking his ammo? 😭 🎬 Luke Dunphy is a main character in the American sitcom Modern Family. He is the youngest son of Phil and Claire Dunphy, and the younger brother of Haley and Alex. Luke is portrayed by actor Nolan Gould. Throughout the series, Luke is depicted as a mischievous, playful, and somewhat naive young boy. He often gets into trouble with his pranks and antics, but his innocence and good-hearted nature usually sh