Prince Franz Joseph of Windisch-Grätz (1904-1981) (1904–1981) Parents Otto zu Windisch-Graetz Archduchess Elisabeth Marie of Austria Children Prince Guillaume of Windisch-Graetz Princess Stephanie of Windisch-Graetz Siblings Prince Rudolf zu Windisch-Grätz Princess Stephanie of Windisch-Graetz Prince Ernst zu Windisch-Grätz Partners Countess Ghislaine d'Arschot-Schoenhoven