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They were relatives

Yes, but it takes a lot of inbreeding for all of them to look alike.

They were 3rd cousins, meaning they had the same 2nd great grandparents.

They were first cousins, they were both grandchildren of Queen Victoria.

Actually their common grandparent was not Queen Victoria, but rather King Christian of Denmark.

Yeah, it gets a bit confusing when you add in the German Emperor, Wilhelm II.

* George V and Nicholas II share Christian IX of Denmark as a common grandparent

* George V and Wilhelm II share Victoria as a common grandparent

* Nicholas II and Wilhelm II are more distantly related to each other (second cousins once-removed through Frederick William III of Prussia)

Also Nicolas’s wife Alexandra was Victoria’s granddaughter and a cousin of George and Wilhelm.