Dear Kenzie, Any of our inflatables can be used indoors as long as you have the space for them, and as long as they are properly anchoring them with weighted sandbags. For entertaining several children, a larger bouncer like the Superstar, or even the Magic Ultra 12 would be great as both models can hold several kids at once. Because you have children with varying ages, slides are usually more fun to older kids, so a combo with a slide and a bouncer could be perfect for you. Ultimately, it does come down to personal preference. If the inflatable isn't a surprise, you might consider asking the kids to help you choose. I hope this helps! Sincerely, Blast Zone Support