Niko , am in similar place, although ds1 is now 9 and worsening (Christmas.... full moon.... who Knows?)
What you say about how much is your obligation- I totally understand that.
My obliation is to do everything I can, I think; anything within the home setting I can think of is done- I let the school know anything worthwhile, from when I now he has a 'target' or a v bad day to sharing techniques / books etc.
And there it stops, for I can only do what I can: I tried tackling the impossible. It was, predictably, impossible.
Now I'm not bothered whether ds is in ms or sn, my other 2 kids will be 1 in each shortly. My concern is only that he and the others around him are safe, for that I will follow school advice. I am aware there are hints of sn or ebo school post 11.
I am worried about other children and I make my best effort to ensure they're safe as thats best for ds1. I email worries about children I know he's upset with to the head: this also gives me backup if any parent tries to sue me (is that possible?) if ds does hurt them, but thats a useful side benefit.
I have a rehearsed standard reply for parents and children who complain- 'i am so sorry, please do tell a teacher'- I did get accused of trying to absolve myself of resposibility by that, but I need teachers told as its only with their backing ds could ever get a place in a unit.
I'd love to give a copy of the SEN code to people too, i swear most of them think I just tick a box saying ' I want ds1 in MS school' and get my way; with ds3 it was a fight I lost to get him into SN, then after a year school agreed anyway and he is is process of panels atm.
What they also don't consider of course is that ds1 saves his best behaviours for home () and ds2 and I often get hit, increasingly me actually.
'We are quite new to this and have two older children who have never caused problems so it's really hard to see your child slap others'
Yes it is, hugs again. I have 3 other kids, the 2 old enough are gentle souls.