How many movies have Jörg Grünler and Petra Kelling collaborated on?

They have worked on 4 movies together! Their first movie together was Das Geheimnis des roten Hauses (2005) while their highest rated movie together was Neger, Neger, Schornsteinfeger (2006). They have not worked together since Abschied von Hannah (2012). They are most known for their drama films together.