Walmart tents are a great way to get your family out camping on a budget. You might consider a low profile tent if you have a disability. They are more maneuverable and will let you walk around the tent. You and your family will enjoy a large amount of floor space. One square foot will allow you to fit an air bed, a sleeping bag, as well as all your personal gear. If you intend to change into your tent, you'll need a place to sit. Generally, 25-30 square feet will do the trick.