Question: Who is the father-in-law of Grand Duchess Elena Vladimirovna Of Russia?
Sentence (from "Prince Nicholas of Greece and Denmark"): Prince Nicholas of Greece and Denmark (22 January 1872 – 8 February 1938), of the Glücksburg branch of the House of Oldenburg, was the fourth child and third son of King George I of Greece, and of Queen Olga.
Relevant evidence: Yes