With five people, you're better off at the DLH or the PPH. The rooms are a bit larger than the rooms at the GCH, and they have 2 queen beds and a day bed (most rooms have a day bed). Plus, they have plenty of room for a rollaway bed as well.
At the GCH, really the only regular rooms that could fit 5 people are the rooms with 1 queen bed/bunk bed/and a trundle. This would work well with parents and three smaller children (not teenagers because the bunk beds and trundle would be rather short for teens). Other than that, you'd have to get a room with 2 queens and a rollaway, but it would be a tight fit.