The Boat Is Full (1981)

During World War II, a ragtag band of refugees from Germany sneaks into Switzerland seeking asylum. The owner of a small inn agrees to allow the refugees to stay if they pose as a family. Yet a single refugee may unwittingly expose the deception...a young boy who speaks only French, alone among a group of adults who speak only German. Can the boy be made to understand the gravity of maintaining his silence as he holds the group's fate in his small hands?