YMMV - when our kids were in those ages, they have been flexible. In my case, I go there at least twice a year and sometime I even booked with just 1 and check in with family since single and double are the same price and kids in those ages are free. No issue with lounge access for all of us either.
Here and everywhere else, when rollaway is available, you can ask for one if you have a king standard room. I have no success in getting a rollaway if we already have 2 beds in the room.
Thank you so much for your reply. This is important because I am trying to use points to book a standard room. Only king suite is available for 4 people.