Mary Corleone is a fictional character in the The Godfather Part III, portrayed by Sofia Coppola. She is portrayed as the daughter of Michael Corleone and Kay Adams and sister of Anthony Vito Corleone.Mary first appears as a baby in The Godfather Part II.Mary, although close to her father, is sheltered from the violent world of the Corleone crime family. She is just as precious to Michael as her brother is to him. Upon meeting, she falls in love with her cousin, Vincent 'Vinnie' Mancini-Corleone, who is also Michael's hotheaded proteg