Poss. HM George I's 11-Great Grandmother. Poss. U.S. President [GARFIELD]'s 15-Great Grandmother. Poss. PM Churchill's 17-Great Grandmother. Poss. Lady Diana's 17-Great Grandmother. Poss. PM Cameron's 19-Great Grandmother. Poss. Louis XVII's 13-Great Grandmother. HM Juan Carlos' 21-Great Grandmother. Poss. `Osawatomie' Brown's 16-Great Grandmother. Poss. Jamie's 18-Great Grandmother.