What exactly did the solicitor provide to the school? and how do you know it?
I'm guessing the kids are protected persons? I'm also guessing the solicitor provided a copy of the avo paperwork to the school. That would be entirely appropriate.
So let's pretend the solicitor sent the police statement along with the avo. First problem is how do you know that for sure? you dont. Even if you did know, well it isn't defamation, it is simply the ex's police statement. No doubt the solicitor had to write a letter explaining why they were sending this stuff and I don't know if you have a copy of that letter... Do you? I'm guessing no. But if you do, unless it makes very clear statements - stuff like - on the 2nd July 2021 you broke her nose, then you might have something for defamation, but once you keep reading you'll realise NOPE not even then...
Worse - so the letter went from the solicitor to the school principal. Did the principal photocopy it and send it to all the parents of all the students? NOPE. If he did, the damage to your reputation would be huge - worth suing.... But nope. Not the case. It is very unlikely the principal would have shared that information in detail to anyone. Principal would have told the admin staff that if you go to the front office to get the kids you will not be given access. To be fair, based on the terms of the avo, the school has a duty of care to keep the kids away from you. But the principal would not have gone into details about why. It is a fact that there is an avo against you and the kids are protected. You can't sue for defamation when the information is factually correct.
Next - you want to sue a law firm for defamation? They are lawyers, they don't need to hire lawyers. YOU DO... It will cost you a bomb. You will have no money left to fight the family law matter. So win the defamation and never see your kids again because you can't afford family law OR suck it up and spend your $ on family law. Your choice.
And - if as i suspect it is just the avo, then it is simply notifiying the school that they have a responsibility to keep the kids away from you.
Do you hate me yet? Mate, go post in the family law section. Ask for help about mediation, avo's and family law. Go on... I'll give you some good advice there. But realise the above is good info. Often the best legal advice is the stuff you hate hearing but upon reflection have to accept as good advice.
Final thought - right now things are rough for you. It is easy to make mountains out of mole hills. I'm sorry you're going through this crap. You are starting to realise that the family law system is pretty crook but don't lose hope. Look after yourself. For what it is worth and to give you a little ray of sunshine - I've been there. I'm a school teacher in a small town. My ex even gave the avo to my principal, no valid reason, she just wanted to piss me off. I was crushed. Humiliated
Truth be known, my ex used to hit me.. I never hit her. I kept a sleeping bag in my car so I could escape and sleep at a park and get home early in the morning to have a shower before going to work... BUT - these days, the kids live with me. The eldest refuses to talk to mum. The younger 2 kids visit in holidays. I have a great new missus who doesn't hit me. She works, not like the ex who sponged off me and hit me in the head to say thanks... And tomorrow I'm flying to Bali. When the kids visit their mum we go overseas. Life is good.