How many movies have Felice Di Stefano and Gianfranco Di Stefano collaborated on?

They have worked on 3 movies together! Their first movie together was Brother Outlaw (1971) while their highest rated movie together was Erotic Games of a Respectable Family (1975). They have not worked together since Erotic Games of a Respectable Family (1975). They are most known for their thriller films together.