Has all the nobility in Germany been abolished to the extent that the monarchy has in Greece? There are still an awful lot of princes and grand dukes left in Germany, a good deal of whom are related to the Windsors!
It'll be interesting to see if Pavlos and Marie Chantal take the title of King and Queen when his father dies. At least Constantine actually was a king once upon a time but his son never was and never will be. I wouldn't put it past MC to start calling herself Queen of the Hellenes!