HM George I's 14-Great Grandmother. Poss. HRE Charles VI's 14-Great Grandmother. Poss. U.S. President [BUSH-41]'s 25-Great Grandmother. Poss. PM Churchill's 19-Great Grandmother. Lady Diana's 22-Great Grandmother. PM Cameron's 24-Great Grandmother. HRH Albert II's 20-Great Grandmother. Louis XVII's 16-Great Grandmother.