2004 film by Jean-Loup Hubert

Simple is 26 but he has the intellectual abilities of a three year old. Simple is handicapped. Since the death of his father, he lives with his mother and his younger brother Kléber. But when their mother dies in a car accident, the brothers are left to their own devices. Kléber is going to take his big brother under his wing, but for the two young brothers life is not a chimera.