Queen Louise of Denmark in Russian court dress. She was the consort of Christian IX, and two of her daughters were Alexandra, queen of Edward VII of Great Britain, and Marie Feodorovna, Empress of Russia. I suspect that this was painted to commemorate her daughter being crowned Empress of Russia in 1882.
King Christian IX of Denmark with all of his six kids. 1903. From top (starting left): King George I of Greece, Queen Alexandra of Great Britain, Crown Prince Frederick (later Frederick VIII of Denmark), and Prince Valdemar of Denmark. From bottom (starting left): Tsarina Maria Feodorovna, King Christian IX, and Princess Thyra.
Photo 1921 The Norwegian Royal Family. King Haakon VII, Queen Maud, and Prince Olav. King Haakon was a member of the House of Schleswig-Holstein-Sonderburg-Glucksburg. Maud of Wales was the daughter of the future Edward VII of the United Kingdom and Princess Alexandra of Denmark. Prince Olav (Olav V) was the father of the current King Harald V.