Thyra, The Crown Princess of Hanover, Duchess of Cumberland and Teviotdale (till 1919 she was also Princess of Great Britain and Ireland and Duchess of Brunswick and Luneburg, she was a born Princess of Denmark, a sister of Queen Alexandra of Great Britain and Empress Marie Feodorovna of Russia) & the German Empress Augusta, née Princess of Schleswig-Holstein, wife of Kaiser Wilhelm II.
[Young] Kaiser Wilhelm II - Frederick William Victor Albert of Prussia (1859-1941) was the last German Emperor (Kaiser) King of Prussia, ruling from 1888 to 1918. He was the eldest grandson of the British Queen Victoria related to many monarchs princes of Europe...his first cousins King George V of the UK, founder of the House of Windsor, Marie of Romania, Queen consort of Romania the Czarina Alix of Hesse, consort of his 2nd cousin Tsar Nicholas II of the House of Romanov
Imperial Germany's Kaiser Wilhelm II (next to servant) with Prince Heinrich (naval uniform) and General von Heeringen prepare to have coffee on the veranda, photo taken possibly c. 1910. Four years later Wilhelm took Germany into WW1.