And why all the royalty of Europe are/were very much related.
The lovely left overs of the Roman Empire.
Well, Albert and Victoria did their part to marry off their children to the other ruling families. It was intended to make peace easier to keep and wars would fade away.
Princess Victoria, their daughter married to Frederick III, German Kaiser, mother of Wilhelm II, Kaiser during WWI.
Four royal monarchs were grandchildren. Wilhelm II of Germany, George V of England, Ernst Louis, Grand Duke of Hesse, Carl Eduard, Grand Duke of Saxe-Coburg and Gotha.
And this doesn't even include the Russian royal family...or what went on before Albert and Vicky...