Whether your just going camping, or bugging out to a friends house, its important to have some tents on hand. Keep in mind that if you and your family need to leave your home, tents offer portable shelter. During hurricane season, hundreds of thousands of people evacuate, and have nowhere to go. Having your own portable shelter provides more options on where to spend the night at.
Besides tents, every family member should have a sleeping bag, pillow, and maybe even a cot or air mattress. During an evacuation, having your own portable shelter provides more options then having to stay in a shelter supplied by city, church, or some other organization.