How many movies have Hetty Heyting and Martijn van Nellestijn collaborated on?

They have worked on 6 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 de Pepernoten Chaos (2013). They are most known for their family films together.