As far as I know, there is only one Royal Family, but I guess the number of the family member is quite big, that is why they have a few palaces. The kingdom is rather small compared to those in Europe, which is why the Palace might be different from those that you have there.

Thank you very much for picking my post into the ourpick selection.
Certainly, I will visit the palace and will make the post about the inside of the palace. ; )