Well, you can get a kid suite which will accomodate 6 - but we have found the price on those is usually so high you're better off getting two rooms instead.
On the Kids Suite ~ We have stayed in a Kid's Suite at HRH, and actually, it only has a King Size bed and a seperate bedroom with 2 twin beds. It only slept 4.
My brother had the kids suite, that couch in the room with the king bed sleeps 2 more, It is full size or queen pull out. Biggest issue here, ONE bathroom. 2 connecting rooms better, get 2 bathrooms.........