Poss. U.S. President's 11-Great Aunt. HRH Charles's 13-Great Aunt. PM Churchill's 12-Great Aunt. Lady Diana's 12-Great Grandmother. P.M. Cameron's 12-Great Aunt. HRH Albert II's 14-Great Aunt. Philippe of Belgium's 14-Great Aunt. Poss. Jamie's 13-Great Aunt.