Paula Kassig asks ISIS to respond to the family 's plea for her son 's life . `` Please tell us what more we can do , '' she says via Twitter . Her son converted to Islam in captivity and took the name Abdul Rahman Kassig . He was captured by Kurdish forces last year after he tried to escape from a prison near Mosul.
Paula Kassig asks ISIS to respond to the family 's plea for her son 's life . `` Please tell us what more we can do , '' she says via Twitter . Her son converted to Islam in captivity and took the name Abdul Rahman Kassig . He was threatened at the end of a video showing the killing of UK hostage Alan Henning .