35 year old Parvin Rema cooks breakfast. Parvin and her mother have a mutual husband. Among the Mandi, a remote hill tribe in Bangladesh and India, widows who wish to remarry must choose a man from the same clan as their dead husband. The only single males, however, are often much younger. So the custom evolved that a widow would offer one of her daughters as a second bride to take over her duties -including sex- when the daughter came of age.