I hope the parents REALLY agreed to the letter.
My school tried to TRICK ME into allowing a letter sent out telling the community about my transition. The principal handed me the letter and asked whether there is anything I wanted to change. If I had said no, that the wording was OK, they would have been able to say "well she approved the letter, so she's agreeing to have it sent out."
Instead I told them it was a violation of my rights, and immediately contacted my union.