I agree with your mom too. If the principal isn't going to fix this problem you need to go over his head. Letting a 10 yr. old see nudity, even if FF mode, is wrong. If the school is still going to let this sub teach at that school I would demand they contact you if she is ever in your childs class. Then I wouldn't allow your child to go to school that day.

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TLJ ~ Where opinions are encouraged, not deleted

You laugh at me because I am different,
I laugh at you because you are all the same.

Your mind is like a parachute, it only works when it is open.