How many movies have Peter Hartshorne and Robert Hartshorne collaborated on?

They have worked on 5 movies together! Their first movie together was Thomas & Friends: Day of the Diesels - The Movie (2011) while their highest rated movie together was Thomas & Friends: Tale of the Brave: The Movie (2014). They have not worked together since Thomas & Friends: Sodor's Legend of the Lost Treasure: The Movie (2015). They are most known for their family films together.