Ed and Peter Kassig urge ISIS to release their son . Abdul-Rahman changed his first name to Peter Kassig when converting to ISIS . `` We implore his captors to show mercy , '' his father says on videotaped message . `` Most of all , know that we love you , '' his mother says to son .
Ed and Paula Kassig urge ISIS to release their son . Peter Kassig changed his first name to Abdul-Rahman when converting to Islam . `` We implore his captors to show mercy , '' his father says on videotaped message . `` Most of all , know that we love you , '' his mother says to son .