Question: When did Princess Alexandra Of Saxe-Coburg And Gotha's mother die?
Answer: 24 October 1920

Grand Duchess Maria Alexandrovna of Russia (later Duchess of Edinburgh and Duchess of Saxe-Coburg and Gotha; ; – 24 October 1920) was the fifth child and only surviving daughter of Emperor Alexander II of Russia and his first wife, Princess Marie of Hesse and by Rhine. She was the younger sister of Alexander III of Russia and the paternal aunt of Russia's last emperor, Nicholas II. In 1874 Grand Duchess Maria Alexandrovna married Prince Alfred, Duke of Edinburgh, the second son of Queen Victoria