Nenette and Boni(1997)

Original title: Nénette et Boni

Teenage siblings Nenette and Boni were raised apart as a result of their parents' divorce. Their mother, who doted on her son Boni, has died. He works for an interesting couple as a pizza baker, and is surprised and enraged when his younger sister, having run away from boarding school, suddenly turns up. There's a problem that they must confront.