I don't have kids, so I've never had to deal with this sort of thing, but I do agree that having open communication with the father/parents is the best bet. Maybe you can invite them over for dinner and discuss? Or better yet, have a 'reptile day' at school with your calmest ones. I'm not sure if that would be feasible, but it can go a long way to get parents comfortable and kids excited about herps. Good luck, and I hope everything works out for you and yours!