I am looking at scheduling our first Disney Cruise vacation but want to do so on a budget. We are a family of four with DS9 and DD5. When I input the entire family for the cruise I want, there are no inside staterooms available, only the verandah staterooms. If I input just two adults, the inside staterooms are available. The description says that these rooms sleep 3 or 4. Is there an explanation of why I can't book the inside stateroom with my family? Can I book it with two adults and add the kids later? Thanks for your help.