ISIS has created training camps where boys are taught to assemble, handle and use firearms, as well as being show stonings, beheadings and crucifixions. In a video, a very young boy specifically takes an oath pledging allegiance to the Islamic State and reveals what he would do to an infidel:
Infidels…you are to be killed.
A 13-year old boy and his family fed to to Turkey.
When we go to the mosque, they order us to come the next day at a specific time and place to [watch] heads cut off, lashings or stonings. We saw a young man who did not fast for Ramadan, so they crucified him for three days, and we saw a woman being stoned [to death] because she committed adultery.