You are replying to a post which is over a year old, so the information in this thread is now out of date.
See the following FAQ on keypad options. ( this is a clickable link)
Also, if the issue is just something simple for kids to use, the new SmartThings/ADT security panel system offers a key fob device for disarming. Note that this device can only be used with that specific model, not with the original hub. But if you haven’t bought your hub yet, and you are primarily interested in security, you should definitely look at the ADT/SmartThings things model.