Have you booked the towncar or the van? We had our family of 5 in their van, our ds are older and bigger, we had 3 suitcases, carryon and 3 backpacks etc. He even had a car seat in there as standard so there is lots of room in their van. We cramped all 5 of us in the towncar once. It was not good. So I guess that matters what vehicle you are having, but the towncar trunk is pretty big, are you having your own stroller etc.