England is not the only royal house infested by Germans. The Oranjes of Holland are in fact German.
Prince Bernhard, the father of the now ruling queen, is even rumored to have had ties with the Gestapo in WWII. As if that wasn't enough the queen married another German, (the late) Prince Claus, former Hitler Jugend. That makes the crown prince 75% German, maybe even more if you do research on older relatives.