Question: Who is the father-in-law of Countess Xenia Czernichev-Besobrasov?
Sentence (from "Archduke Rudolf of Austria (1919–2010)"): Archduke Rudolf of Austria (5 September 1919 – 15 May 2010) was the sixth child and youngest son of Emperor Charles I of Austria and Zita of Bourbon-Parma.
Relevant evidence: Yes