In The Godfather, Don Vito Corleone is mad with Santino about talking out of turn while he is having a conversation with Sollozo about not wanting to bankroll ("finance") their drug business. Vito says to Santino, "What's the matter with you? I think your brain is going soft from all the comedy you're playing with that young girl. Never tell anyone outside the Family what you are thinking again."
He also has several mistresses, including his sister Connie's friend Lucy Mancini.