Dad told stories of when he was young, walking to school with his shotgun so he could hunt on the way home. Shotgun would be inspected by teacher to make sure is wasn't loaded and stored in the cloak room until the end of the day.
Was no big deal.
Sadly, as things are today....Kudo's to you for the very wise way you handled the situation.
Maybe at some point and time you can bring this up to the kids parents and get permission to show them.