HM George I's 11-Great Aunt. U.S. President [JEFFERSON]'s 15-Great Grandmother. HRH Charles's 20-Great Grandmother. PM Churchill's 18-Great Grandmother. Lady Diana's 19-Great Grandmother. PM Cameron's 19-Great Grandmother. HRH Albert II's 21-Great Grandmother. Poss. Agnes Harris's 14-Great Aunt. `Osawatomie' Brown's 17-Great Aunt.