Michael Corleone is the Don Corleone's youngest son and just recently returned from serving in WWII. Michael is Vito's only college-educated child and does not want to be apart of the family business. However, when his father is nearly killed, Michael steps up to be the boss he needs to be.
Kay Adams: Michael, you never told me your family knew Johnny Fontane! Michael: Oh sure, you want to meet him? Kay Adams: Yeah! Michael: You know, my father helped Johnny in his career. Kay Adams: Really? How? Michael: ...Let's listen to this song.