Princess Stephanie of Windisch-Graetz's mother was a member of what political party?
Archduchess Elisabeth Marie of Austria Archduchess Elisabeth Marie of Austria (Elisabeth Maria Henriette Stephanie Gisela; 2 September 1883 – 16 March 1963) was the only child of Rudolf, Crown Prince of Austria and Princess Stéphanie of Belgium, and a granddaughter of Emperor Franz Joseph I of Austria and King Leopold II of the Belgians. She was known to the family as "Erzsi", a diminutive of her name in Hungarian. Later nicknamed "The Red Archduchess", she was famous for becoming a socialist and a member of the Austrian Social Democratic Party.
Princess Theresa of Bavaria (b. 1931) Archduchess Theresa of Austria, German: "Theresa Monika Valerie Elisabeth Ludovika Walburga Anna, Erzherzogin von Österreich" (born 9 January 1931 at Schloss Wallsee in Amstetten, Lower Austria, Federal State of Austria) is a member of the Tuscan branch of the House of Habsburg-Lorraine and an Archduchess of Austria and Princess of Bohemia, Hungary, and Tuscany by birth. Through her marriage to Prince Rasso of Bavaria, Theresa is also a member of the House of Wittelsbach and a Princess of Bavaria.