How many movies have Frank Groothof and Lex Goudsmit acted in together?

They have worked on 12 movies together! Their first movie together was Sinterklaas in Sesamstraat 1987 (1987) and was their highest rated movie together. They have not worked together since Sinterklaas in Sesamstraat 1999 (1999). They are most known for their family films together.