No, he isn't. He is a divorce lawyer. Those are a dime a dozen vultures, and not really liked by anyone. He is not the DA or anything even remotely close, a divorce lawyer is one or two steps up from an ambulance chaser.
That's more believable than him suing the school.
True, but this isn't just some product that can be replaced. If they were suspended or expelled and he did go ahead with trying to sue the school, it calls their credibility and integrity into question as a carer. Wouldn't that leave them open to sue him right back for... Intimidation, or something?