HM George I's 11-Great Grandmother. U.S. President [T. ROOSEVELT]'s 16-Great Grandmother. PM Churchill's 17-Great Grandmother. Lady Diana's 19-Great Grandmother. PM Cameron's 20-Great Grandmother. HRH Albert II's 19-Great Grandmother. Louis XVII's 15-Great Grandmother. Gen. Pierpont Hamilton's 16-Great Grandmother. Poss. Jamie's 19-Great Grandmother.