How many movies have Erik-Jan Slot and Hetty Heyting collaborated on?

They have worked on 5 movies together! Their first movie together was Sinterklaas en het Geheim van de Robijn (2004) while their highest rated movie together was Sinterklaas en het Uur van de Waarheid (2006). They have not worked together since Sinterklaas en het raadsel van 5 december (2011). They are most known for their family films together.