The father of XXX is whom?
Princess Sophie of Hohenberg
Princess Sophie of Hohenberg (German: Sophie Fürstin von Hohenberg, fully Sophie Marie Franziska Antonia Ignatia Alberta von Hohenberg, Czech: Žofie z Hohenbergu; 24 July 1901, Konopiště -- 27 October 1990, Thannhausen) was the only daughter of Archduke Franz Ferdinand of Austria and his morganatic wife Sophie, Duchess of Hohenberg, both of whom were assassinated at Sarejevo on 28 June 1914.
Franz Ferdinand of Austria