Question: Who is the mother-in-law of Countess Claudine Rhédey Von Kis-Rhéde?
Answer: Henriette of Nassau-Weilburg

His father was Duke Louis of Württemberg, brother of King Frederick I of Württemberg and Empress Maria Feodorovna of Russia. His mother was Princess Henriette of Nassau-Weilburg, a great-granddaughter of George II of Great Britain through his eldest daughter Anne, Princess of Orange.