How many movies have Francis Ford Coppola and Gian-Carlo Coppola collaborated on?

They have worked on 3 movies together! Their first movie together was The Conversation (1974) while their highest rated movie together was Hearts of Darkness: A Filmmaker's Apocalypse (1991). They have not worked together since Hearts of Darkness: A Filmmaker's Apocalypse (1991). They are most known for their drama films together.