Despite the gameplay mechanics showing how narrow the Sun Palace is. It would actually be much larger. We've only seen a few bedrooms on the second floor and a couple of meeting rooms.
The Royal Family's bedrooms would actually be much larger than depicted in the game. One example is that Sialeeds' room only had a desk inside.
The Royal Family (Frey, Lym, and Sialeeds in particular) would actually have a living room, a bedroom, and a bathroom.
It's unknown where the Queen's bedroom would be.
Also, on the east wing where the Prince's room is. The Bodyguard's Quarters would more than likely be Lyon's. The third door contained a bedroom and of course the fourth door is the storage room where unfortunately Godwin's servants had to sleep in.
Wonder who's room that is that's next to Lyon's?
The rest of the Queen's Knights would take up residence in other parts of the Sun Palace.