Question: When did Prince Dmitri Alexandrovich Of Russia's mother die?
Sentence (from "Grand Duchess Xenia Alexandrovna of Russia"): She was the mother-in-law of Felix Yusupov and a cousin of Grand Duke Dmitri Pavlovich of Russia who, together, killed Grigori Rasputin, holy healer to her nephew, the haemophiliac Tsarevich Alexei Nikolaevich of Russia.
Relevant evidence: No