Almost, if not all, rooms have a daybed. Unless you book an unusual category you will have two queens and a daybed/couch. We have stayed at the GF RPC and SL many times and we have always had a daybed - although sometimes we were in a King bed (bookable category, so don't worry) instead of the two queens. If you do get checked in with an unsuitable room such as a king bedroom, just let the CL CM's know and they will get you a better room for your party size.
Have you stayed in the GF before? You will LOVE it there, especially with CL. Be sure to have tea and scones with clotted cream some afternoon! Yummy!