You make a good point Sara - if you assert yourself as an authority figure from the beginning, even with something as minute as how you are addressed, I think that kids will respond to that. I volunteer at church with the kids two days a week, and I am known as "Miss Jen." It's respectful but familiar at the same time, and *most* of the kids behave well.
Sometimes it's actually the parents who you want to correct. I can imagine you see it all the time. Just out of curiousity, why don't any of you like doing the homeschooled groups?
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