It's really cool that you're teaching your children not to be afraid of snakes. I know so many people who freak out at the thought of one; they're the type who would panic and do something stupid if they ever saw one in the wild outdoors (e.g., their own backyard!).
I taught my sons how to catch them properly (and how NOT to catch them--like not by the tail when you can't see the head!), how to identify them--important where I live, as we have venomous snakes (goes with not catching one when you can't see its head!), and how to care for them. We learned a lot about them together.