 The three children and seven grandchildren of her daughter Princess Catherine, who married and later separated from Marchese Farace di Villaforesta, are the only great-grandchildren of Grand Duke Constantine Constantinovich of Russia and his wife Grand Duchess Elizabeth Mavrikievna.Helen voluntarily followed her husband into exile when he was arrested following the Russian Revolution of 1917 and tried to obtain his release.John was imprisoned first at Yekaterinburg, Siberia and later moved to Alapaevsk, a town in Sverdlovsk Oblast by the Bolsheviks, where would be murdered on 18 July 1918 along with Grand Duchess Elizabeth Feodorovna, Grand Duke Sergei Mikhailovich; John's brothers Prince Constantine Constantinovich and Prince Igor Constantinovich, his distant cousin Prince Vladimir Pavlovich Paley; Grand Duke Sergei's secretary, Fyodor Remez; and Varvara Yakovleva, a sister from the Grand Duchess Elizabeth's convent.