Poss. U.S. President [TAFT]'s 15-Great Grandfather. Poss. Lady Diana's 17-Great Uncle. Poss. PM Cameron's 18-Great Uncle. Poss. Philippe of Belgium's 20-Great Uncle. Poss. Grand Duke Henri's 20-Great Uncle. Poss. Gen. Pierpont Hamilton's 16-Great Grandfather. Poss. Agnes Harris's 5-Great Grandfather.