Royalty is a good word for describing a family of kings, queens, princes, and princesses. If you are in the music business, you may expect a payment, or royalty every time your song is played. How's that for royal treatment?
The noun royalty means a group of royals, or kings and their extended families. Queen Elizabeth of England is a member of Britain's royalty, for example. You can also use royalty to describe the payment a writer receives whenever her book is sold, or that a musician gets when his song is played in a grocery store. The word comes from the Latin regalis, "regal," which in turn comes from rex, "king."