Sophie was born in D*sseldorf as the only daughter of Prince William of Saxe-Weimar-Eisenach and his wife Princess Gerta of Ysenburg and B*dingen in W*chtersbach. She was a great great granddaughter of Charles Augustus, Grand Duke of Saxe-Weimar-Eisenach, as well as a great granddaughter of William I of W*rttemberg. On her mother's side, Sophie was a great granddaughter of Frederick William, Elector of Hesse's morganatic marriage to Gertrude Falkenstein, Princess of Hanau.
Sophie
Gertrude Falkenstein