How many movies have Inge Ipenburg and Sonja Visser collaborated on?

They have worked on 3 movies together! Their first movie together was Sinterklaas en de Verdwenen Pakjesboot (2009) while their highest rated movie together was Sinterklaas en het raadsel van 5 december (2011). They have not worked together since Joris and Boris (2012). They are most known for their family films together.