Duchess Alexandrine of Mecklenburg-Schwerin (24 December 1879 – 28 December 1952), who married King Christian X of Denmark on 26 April 1898. They had two sons. They had two sons. Frederick Francis IV, Grand Duke of Mecklenburg (9 April 1882 – 17 November 1945), who married Princess Alexandra of Hanover on 7 June 1904.
Grand Duchess Elena Vladimirovna of Russia (29 January 1882 – 13 March 1957), sometimes known as Helen, Helena, Helene, Ellen, Yelena, Hélène, or Eleni, was the only daughter and youngest child of Grand Duke Vladimir Alexandrovich of Russia and Duchess Marie of Mecklenburg-Schwerin.