Princess Stephanie of Windisch-Graetz's mother was a member of what political party?
Princess Stephanie of Windisch-Graetz Princess Stéphanie of Windisch-Graetz (April 4, 1909 in Ploskovice, Bohemia – May 29, 2005 in Uccle, Belgium) was the daughter of Prince Otto Weriand of Windisch-Graetz (1873–1952) and Archduchess Elisabeth Marie of Austria (1883–1963), only child of Crown Prince Rudolf of Austria and Princess Stéphanie of Belgium. She was the great-grandchild of Emperor Franz-Joseph and Empress Elisabeth ('Sissi') of Austria. She was also the great-grandchild of King Leopold II of Belgium.
Princess Herzeleide of Prussia Princess Herzeleide-Ina-Marie Sophie Charlotte Else of Prussia (25 December 1918 – 22 March 1989) was a member of the deposed House of Hohenzollern. She was the only daughter of Prince Oskar of Prussia (the second youngest son of Emperor Wilhelm II) and his morganatic wife ,Countess Ina Marie von Bassewitz. She is the mother of Ernst-Johann Biron, Prince of Courland, the current head of the House of Biron.