Mein Vater ist ein Dieb(1983)

When the ten-year-old Til and two of his friends are caught in heavy rains, they escape into a barn. They are not alone in there, however. A man whom they do not recognize is obviously stealing crop from the barn. When the friends investigate the matter, Tim discovers the terrible fact that the thief is his own father. Since he wants to keep his discovery a secret by all means, he sets his friends on the wrong track. Although Til is embarrassed and would like to know the reason for the thievery, he does not have the guts to take his father to task. Eventually, he breaks the secret to the coachman Paul. In the meantime, however, his friends have also found out about Til′s father and the case is revealed.