I know a Dutch girl with German parents. She always says she likes to have her period, because she loses some German blood.
And the anthem. A serious answer is of course that Dutch, German and British royalty are very intertwined. The grandfather of our king even had an SS membership, before he married a Dutch princess and turned to the allied side during WWII. The Ferrari driving, Spitfire flying playboy Bernhard, with at least two daughters with other women. Love the guy. We need more of such people