Santino "Sonny" Corleone is a fictional character in Mario Puzo's 1969 novel The Godfather and its 1972 film adaptation. The character also appears in various flashback sequences in the film's 1974 sequel, The Godfather Part II.In the novel and film, he is the oldest son of New York City Mafia Don Vito Corleone and Carmela Corleone. He has two brothers, Fredo and Michael, a sister, Connie, and an adopted brother, Tom Hagen.