Duke Friedrich, Hereditary Duke of Württemberg German noble (1961-2018) (1961–2018) Parents Duchess Diane, Duchess of Württemberg Duke Carl, Duke of Württemberg Children Duchess Marie-Amelie of Württemberg Duchess Sophie-Dorothea of Württemberg Duke Wilhelm, Duke of Württemberg Siblings Duke Michael of Württemberg Duchess Eleonore of Württemberg Duke Eberhard of Württemberg Duchess Mathilde, Princess of Waldburg-Zeil-Trauchburg Duke Philipp of Württemberg Partners Duchess Marie, Hereditary Duchess of Württemberg