It also depends on where you plan to go camping, if youg going to be in someones back yard or a camp site where there is plenty of space and you will have someone else to hep you put it up then great buy a large tent. if you may be in a position where you won't have a lot of space or will be on your own then it is better to buy a smaller tent as they are easier to put up on your own.
each has its own pro's and cons
Large tents hold lots of people have loads of space, what holds more holds less and all that and own cold nights can take ages to warm up the inside. they also weigh a lot more to carry if you plan going camping anywhere you can't drive to.
Small tents are more limiting on space but they warm up easier at night and can be very light weight if you go on your own, because they are smaller they are also easier to put up solo too and more stable is poor weather.
If you plan to be someone who camps in fair weather then why bother with somewhere that is comfortable and huge where you can stand inside, part of being outdoors is to be outdoors not spending all your time in the tent. Take some folding chairs or sit on the ground and enjoy it camping is great fun and an excelent way to spend time with the family. if it does rain then go inside lie on the sleeping bags untill it stops then get back out again.
The only problem I can see you having is if you intend taking the dog lots of campsite won't allow them on.