We have more than one child, and bought just one. It clips onto a bag, belt, or something so you don't have to carry it around all day, but even with taking turns everyone got tired of carrying it. Don't get me wrong, we all love it, and learned lots of things that we didn't know because Mickey told us, but I definitely would not buy more than one. After our trip our youngest, 7, enjoyed listening to all of the jokes, but that only lasts a couple of weeks after our trips. We keep taking him back with each trip, so I feel like we got our money's worth. Hey, that is just my opinion!
Have fun!
Laura