I should have clarified that we're in a private school, so the food chain only gets me to the principal/head of school (at least in my jurisdiction). There are an astonishing number of people on that chain, given its narrow ambit. Since I am a mere consumer, my only real remedy is to leave if they won't comply. Which I'm working on, but I've still got half a year to navigate.

And I suspect they would be ecstatic if I kept him home, so they could ignore both of us in peace!