Poss. U.S. President [BUSH-41]'s 21-Great Grandmother. HRH Charles's 18-Great Grandmother. Lady Diana's 18-Great Grandmother. HRH Albert II's 18-Great Grandmother. HM Juan Carlos' 18-Great Grandmother. Philippe of Belgium's 18-Great Grandmother. HM Manuel II's 17-Great Grandmother. Ksr Wilhelm II's 16-Great Grandmother.