In the movie Caporegime Peter Clemenza tells Paulie Gato & Rocco Lampone something like “Sonny [Don Vito’s eldest son] is thinking aobut going to the matteresses already.” This is just after Vito has been shot. Clemenza is preparing for the great Five Families War of 1946 by setting up some secret hideouts for the Corleone soldiers.
So while Don Vito Corleone [Marlon Brando] did not utter those specific lines in the movie, the was used. The line originated from the book