Hey there, the best advice I can give you is to do a search for "review" and the brand name of any tent you think you'd like to buy. We bought a tent that looked great and solid, had loads of room, etc. Before we were 2 days into the first camping trip with that tent, 2 of the poles were broken (one of my sons had insisted on bringing duct tape with us that trip, we'd never packed it before, but it ended up saving the day!) This was a Northwest Territory tent, when I did a search to replace that tent I found out reviews that mentioned many problems with it, but mostly breaking tent poles.
The tent we'd had for years and many trips before that was a Greatland, we'd never had any problems with it, easy to set up, lots of room for a family with smaller kids. We were replacing it to have more room for the taller people in the family. It was the longer, 3 room tent with the larger room in the middle and two smaller rooms on the side. When the kids were smaller they stayed in the middle room on one full air mattress, my husband and I on a single in one side room and the luggage in the other side room. When the kids got older, we moved to 3 singles in the middle room, our single, and the old luggage side became the space for one kid on a single. We just put each person's luggage at the end of their air mattress. It's a 9 x 13 and we covered it with a 20 x 10 tarp. (Oh, in our section of the tent we kept our suitcase and refrigerator/cooler at the end of our mattress).
Good luck searching.
(ps, thanks for the trip down memory lane, you've got me thinking about the kids all lined up on the air mattress as I'm telling them it's time to wake up to go to the Magic Kingdom. Easiest wake up ever.)