Question: Who is John George Ii, Duke Of Saxe-Eisenach's father-in-law?
Answer: Eberhard III, Duke of Württemberg

Sophie Charlotte of Württemberg (22 February 1671 – 11 September 1717), was a German noblewoman member of the House of Württemberg and by marriage Duchess of Saxe-Eisenach. Born in Stuttgart, she was the ninth of eleven children of Eberhard III, Duke of Württemberg and his second wife, Countess Marie Dorothea Sophie of Oettingen-Oettingen. From Sophie Charlotte's ten full-siblings, only she and his three (unmarried) brothers George Frederick, Louis and John Frederick survive adulthood; in additi