Vito Corleone is a father.
Fredo Corleone . He is the second son of the mafia don Vito Corleone ( Marlon Brando and Robert De Niro ) . Sonny Corleone . In the novel and film , he is the oldest son of the mafia don Vito Corleone and Carmela Corleone . Vito Corleone is a fictional character in Mario Puzo 's novel The Godfather and in the first two of Francis Ford Coppola 's three Godfather films , in which he was portrayed by Marlon Brando in The Godfather and then , as a young man , by Robert De Niro in The Godfather Part II . He has two other sons , Santino ( Sonny ) and Frederico ( Fredo ) and one daughter Constanzia ( Connie ) .