You really need to get some support. Call the LA ask for a family support worker, Early Help, PREVENT but the more low-level one.
Also, email them in detail, I'd be happy to help draft some bits and I'm sure others on here would. When you use the right language etc, or threaten to escalate to certain places they respond. Also keep on emailing, I know you've tried and it shouldn't be like this but you need to continue. Also contact the DSL at school, ask for them to refer to Prevent, YOI team and CAHMs but like the CAHMs for those who have been 'resistent', they still need help and I hate how CAHMs tries to use kids who have issues with trust, trauma, or are more aggressive to be like, don't engage, get of our list. It's ridiculous. Please CC in anyone and everyone.
Also complain to Family Solutions about the last worker, sometimes they can be great other times less so. But complaining can sometimes mean they 'try again' with more skilled people and they are better. Also report to SS and keep on doing it. Paper trails are so helpful with this.
Racism and homophobia get worse, he may start targeting people at school which is unfair, and it will rub off on your younger ones. How old are the younger ones? There are great online resources and books for this sort of thing?
Please send an email detailing it all to his head of year ans CC in the DSL, and pastoral and anyone from SEND. There is support but you have to use it/force then to give it to you. Be tough on sanctions especially for racism and homophobia, he needs to learn that 1. Its unacceptable and 2. Why it is wrong, resources like Everyday Racism and other things online are really helpful. Also make sure he isn't getting sucked into misogyny and Racism on social media, put on like controls on his phone to block it. Its really important.
@Placestogo For now check every day or two, as he progresses maybe make more arguments sort of like an amnesty of giving it to you. You won't ask questions etc, but you will tell the professionals involved and leave it to them. I'd try and track things you find, as you may not know what they are used for but the professional will.
From the inital assembly have they planned out the treatment? Like what specific therapy he'll get? Are they going to use medication?