I've no idea. My recurring dreams are deffo linked to my worries, hopes and fears. One of the most prolific ones I have is my "return to school" anxiety dream.
In reality I flunked out of school and am therefore completely unqualified. In this dream I return to school and rather than make the most of it I find myself lost, unable to learn, and flunking out again. The whole thing clearly stems from a sense of inadequacy, my regrets that I didn't take education seriously, and my desire to learn now.
Your dream is about royal families. Is it possibly about family?