This post shows the only Bosses of the Corleone Family. There were no others, according to Francis Ford Coppola and Mario Puzo.

Vito Corleone (Boss): ?-1950
Santino Corleone (acting-Boss): 1948-1948
Michael Corleone (Boss): 1950-1958
Tom Hagen (acting- Boss): 1958-1959
Michael Corleone (Boss): 1959-1979
Vincent Corleone (Boss): 1979-present