just to confuse you i find that some campers including myself have a couple of different tents depending on the location and the length of time we camp and whether we we just take the car or we have a trailer with us.
there is a big difference in the size of some tents when packed up.
For overnighters to 2 night camps i love to take our 1 room dome tent and we all squeaze in together but its fun and then on longer camps we take our 3 room dome tent,takes longer to put up but more room,kids up 1 end us up the other and food and bits and pieces in the middle.
I personally dont have expensive tents as such based on the fact that family factors change,ie kids get bigger,they do want to share the room with you when small but then like to have their own little section when they are a bit older and now my 11 yr old erects his own pup tent.
mmmmm decisions decisions