They followed them to school and told the teachers that someone called the police for escort.

There's nothing illegal about this and nobody got in trouble but it still sucks.

You are lucky they called the police and not CPS.

CPS have nearly unlimited ability to fuck with your family, whereas police generally can't fuck with you without probable cause a crime has occurred. There is no such process or due process with child protection services as breaking apart families and tossing kids into the abusive foster system is considered 'civil.' CPS doesn't require a criminal law be broken to take action and can declare weaknesses in your parenting for things as simple as dirty dishes in the sink or your refrigerator empty because you're at the end of your grocery cycle.