Never tried it, but one approach with work place arseholes (so may not be 100% applicable)like this is to mirror back what they say as a question/clarification. Not in a "challenging" way, which could get their back up and cause you personnel more grief, but just calmly, politely as if you are just confirming what they want.
"You would like us to get tutors to redo all seating plans with a boy/girl/boy/girl from September and mix up existing friendship groups?"
"You would like the department to remove this set text before September and start a new lesson plan for that paper?"
Often when idiots hear back what drivel they have spouted they will back track themselves...and tend to avoid pontificating/demanding the crap in front of you.
You could then follow up with an equally calm question, again, calm, polite.."If tutors or parent have issues would you prefer to speak with them? Or would you like me to? I am happy either way."
Again, you are doing nothing they can "tell you off" for. Tis almost malicious compliance. But by vocalising back to them what their demands are it makes them think.