How many movies have Patrick Onzia and Walter de Donder acted in together?

They have worked on 4 movies together! Their first movie together was Samson & Gert: Hotel op Stelten (2008) and was their highest rated movie together. They have not worked together since Samson & Gert Kerstshow: Op reis naar het IJspaleis (2013). They are most known for their family films together.