More like King Deutsch of Berlin fame!...They are German!
It's so nice to see the old chestnut of the present Royal family being German appearing again.
Just for the sake of historical accuracy. The present Queen's great grandmother, Victoria, was wholly English, she married a German, Albert, and took his surname, Saxe-Coburg. Her son, King Edward, married Alexandra who was Danish. Their son, King George V married Mary of Teck, who was German. Their second son, who became George VI, married Elizabeth Bowes-Lyon who was wholly Scots. Therefore the most 'German' the present Queen can be is less than 35%. Her son, Charles, married Diana, who again was wholly English, so by far the greater part of William's bloodline is not German. Given that Kate Middleton is also English any children of theirs will be even less German.
On another note, what is wrong with being German anyway? They have a fine tradition of music, architecture, and painting, the many I have met have been lovely people. They were unfortunate enough for a big enough minority to fall under the spell of an Austrian fanatic, which allowed him to seize power, who then led them to almost utter destruction. Again, do not judge people as a nation, but as individuals.
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Mebyon K