Ritchie's fears for children

Guy Ritchie fears his ex-wife Madonna will break their custody agreement and keep the former couple's children in America with her, according to the moviemaker's father.

The British director and the pop superstar finalised their divorce last month and are said to have decided to share custody of their eight-year-old son Rocco and adopted tot David Banda, three - with the kids splitting their time between New York and London.