They were second cousins.
They were cousins
For King or Kaiser - 1915 was released on: USA: March 1915
Two of King George V's first cousins were Tsar Nicholas of Russia and Kaiser Wilhelm of Germany. Kaiser Wilhelm was the grandson of Queen Victoria, so was King George. Tsar Nicholas was the grandson of King Christian IX of Denmark, so was King George. So, the Kaiser and the Tsar were related to King George, but the Tsar was not as closely related to the Kaiser.
If I understand the question correctly, King George V, Kaiser Wilhelm II and Czar Nicholas II were all first cousins. They shared common grandparents in Queen Victoria and Prince Albert.
Gosh No ! Kaiser is the German word for Caesar: Kaiser Wilhelm was the German king in WW1.
The leader of Germany in WW1 was not a king, his title was Kaiser, specifically, Kaiser Wilhelm II
king = König
The King's Will - 1914 was released on: USA: 1 June 1914
The King of the Beggars - 1914 was released on: USA: July 1914
The King of the Bowery - 1914 was released on: USA: October 1914
The King's Minister - 1914 was released on: UK: October 1914 USA: 3 October 1914
A King by Force - 1914 was released on: USA: 13 August 1914