Originally Posted by wartenberg7
This has nothing to do with the real kinship degree. It´s the way european monarchs call each other on an official basis. The british Queen calls fellow Queen Regnants in letters "My dear sister..." (I think only in official ones, not privately) although Beatrix or Margrethe are not her blood sisters like everybody knows.
Did QMII also address King Willem-Alexander and Queen Máxima as "my dear cousins" at the Dutch state banquet ?
I believe that , in this case, she literally meant "cousins" in the kinship sense when referring to the King and Queen of the Belgians.