Have you ever heard the phrase, "You can't get blood out of a turnip."?
The parents, I'm sure, are poor, probably living in government housing with no personal assets whatsoever.
I'm sure what will happen is an action will be filed against the school - they're the only ones with any money. And, I'm also sure that the school will settle. Welcome to tort laws in America.
Of course I have heard the phrase. (Was that a bit of condescension? Prolly.) But those kind of people dislike having anything to do with the law. Suing them would be worth it just for the hassle factor. They would pee their pants just from being served. They need to be made uncomfortable, if they can’t be made accountable.