Question: Who is the mother-in-law of Duchess Alexandra Of Oldenburg?
Sentence (from "Grand Duke Nicholas Nikolaevich of Russia (1831–1891)"): Grand Duke Nicholas Nikolaevich of Russia (8 August 1831 – 25 April 1891) was the third son and sixth child of Tsar Nicholas I of Russia and Alexandra Feodorovna.
Relevant evidence: Yes