Empress Alexandra with her siblings Irene, Ernst, "Ella", and Grand Dukes Paul and Sergeii. The little boy is Prince Valdemar of Prussia. Ella was married to Grand Duke Sergeii Alexandrovich Romanov, uncle of Tsar Nicholas. He was assassinated by an anarchist several years before the revolution. Paul (Pavel) Alexandrovich Romanov was also an uncle to the Tsar.