Question: Who is the mother-in-law of Countess Alexandra Von Zarnekau?
Sentence (from "Countess Alexandra von Zarnekau"): At age 17, on 11 February 1900, Countess Alexandra married Prince George Alexandrovich Yuryevsky, the son of Tsar Alexander II by his mistress (and later wife), Ekaterina Mikhailovna Dolgorukova, the Princess Yourievskya.
Relevant evidence: Yes