HM George I's 8-Great Grandmother. HRE Ferdinand I's 4-Great Grandmother. U.S. President [L.B. JOHNSON]'s 18-Great Grandmother. PM Churchill's 17-Great Grandmother. HM Margrethe II's 16-Great Grandmother. Poss. Gen. Pierpont Hamilton's 17-Great Grandmother. Wm. von Bismarck's 14-Great Grandmother. Boris Johnson's 17-Great Grandmother. `Red Baron' Richthofen's 14-Great Grandmother. Poss. Jamie's 19-Great Grandmother.