The youngest of Maria's siblings was Alexei. He was born in 1904 and was the only son of Nicholas and Alexandra. Alexei was a sickly child and suffered from hemophilia, a condition that made him bleed easily. His illness caused great distress to his parents, who were constantly worried about his health.
The Enigmatic Life of Grand Duchess Maria Nikolaevna: Unraveling the Secrets of a Russian Princess