Yeah but... Queen Vic was Grandmother to just about all the royalty in Europe at the time. Titles of some of her other Grandkids include, King of England (obviously), Grand Duke of Hesse, Duke of Schleswig-Holstein, Queen of Norway, Queen of Romania, Crown Princess of Sweden, Queen of Spain, Queen of the Hellenes (Greece), and Empress of all the Russias.
Her grandson King George was cousins not just with Wilhelm but with Tsar Nicholas, the last Tsar of Russia who got killed when the commies took over.
See, here is George and Nick attending some sort of fancy dress party, you can see the family resemblance: