How many movies have Frans Piët and Jan Kruyk collaborated on?

They have worked on 3 movies together! Their first movie together was Sjors en Sjimmie en De Toverring (1971) while their highest rated movie together was George & Jimmy and the Sword of Krijn (1977). They have not worked together since George & Jimmy and the Sword of Krijn (1977). They are most known for their family films together.