How many movies have Burny Bos and Michiel de Rooij collaborated on?

They have worked on 9 movies together! Their first movie together was The Flying Liftboy (1998) while their highest rated movie together was Where Is Winky's Horse? (2007). They have not worked together since Boys On Film 4: Protect Me From What I Want (2010). They are most known for their family films together.