Maria Nikolaevna had three sisters: Alexandra, Olga, and Tatiana. They were the daughters of Tsar Nicholas II and Empress Alexandra Feodorovna. The sisters were very close to each other and enjoyed playing together and going on picnics. They were also educated together and learned to speak several languages.
The Enigmatic Life of Grand Duchess Maria Nikolaevna: Unraveling the Secrets of a Russian Princess