The suite is suppose to sleep 6 as pp said, but I am not sure wht the problem is with siblings SLEEPING in bed together???
As far as the couple, as has been pointed out, while I think that would be a wonderful opportunity, maybe they really thought that they could pass it on to a young family, or didn't want their day planned out. To each his own. I really wish & hope that it did not get wasted that day.
My son is 16 taller than I am shaving and to all intents and purposes a man. He does not want to share a bed with his 10 yr old sister and I don't blame him. Also I feel it is more appropriate for them to have separate beds.