that is great that you would take the time to teach kids.
i wish i had someone to teach me about bikes when i was younger. i figured out the basics easy. i don't think i fully understood how to lace and straighten a rim until a year or 2 ago. before that point i was just swapping rims instead. by now i think i understand enough to fix almost anything.
if you lived a lot closer i might have even had a couple bikes and lots of parts to donate.