Agreed, churchandstate. It seems to me the more permissive parents are, the more badly behaved children are. I mean, a 7 year old is basically just a grade 2/3 child. The OP seems to not have ever stopped to think that 9pm is utterly ridiculous, even for a first year high school student, let alone a 7 year old small child. In fact, they seem shocked at the idea it is wrong, and saying it wouldn't work for him? Listen, as a parent, you tell a child what works, end of story. If it doesn't work for him, tough. He will learn to make it work for him, if you give him no alternative. The older children shouldn't have to suffer, that's true. But hobby activities may need to be axed for the time being (or get them to return in a taxi). Fact is, this young child is suffering, just because his elder siblings have hobbies. It's not right, he should be prioritised, especially as he is doing badly academically, and is disrupting the class. It means his needs should take priority over the elder children, even if just temporarily. And it's not like it's 'half an hour difference', it is 90 mins difference. 60 mins, at the least. I don't buy that all children are 'different' in so far as what they need. All children need the same thing. Decent bed time hours as well as discipline.
I also don't understand how one can be meeting with the child's school every single week (which in itself indicates the situation is very serious) and yet it never occur to one that their child clearly has learning difficulties or special needs. How can you be going to a school every week because of a child's behaviour, and it never even occur to you that there is a problem? Bad academically and badly behaved, pretty well would raise alarm bells to most people that something is seriously wrong. Yet, they rule out a more sensible bedtime (because other children have hobbies and interests, so other children win out over a child who is obviously struggling). In parenting courses, they address bedtime. And breakfast (hence why I mentioned it, and was shocked that they thought it had nothing to do with it, when it and bedtime are the base things discussed in parenting courses) although he seems to be fine with that. They say it 'won't work' when they've never tried, and show little to no interest in trying. I don't understand how it got this far that they actually think 8:45/9pm is normal. It is not, it is very abnormal, I just don't understand how one can even think it appropriate for a 7 year old small child, how they even ever thought it was ok. They still don't seem to get it, hence I gave up, too.
When I was at primary school my mum made me do my homework as soon as I got home. I was not allowed out to play, until I had done my homework first. My best friend could do her homework if/whenever she wanted, and often sat and waited for me on the verandah while I did my homework, then we could go and play. I went to bed at 7:30 at around 7/8 years old, 6:30/7pm when 5 and 6. I had strict boundaries (mum NEVER let me get out of doing my homework first, not even once!) and did very well. My best friend hated school, had no real boundaries, and left school at 15.
Strict boundaries and rules enforced really make all the difference. But, if one is not willing to even try, automatically writing off something with 'that won't work, he/she won't sleep at that time', then you clearly are not motivated enough to help your child and they don't have much hope.
I could say much more on discipline, lets just say that most of Mumsnet disagree with me on the issue of 'discipline' and decry it violence. The more permissive and more 'time out, take away ipads, tv, toys etc and ban all physical discipline' is clearly not working and is a mistake. Never has there ever been this level of disrespect, rudeness, misbehaving etc from children, and unlike in the days gone by, teachers can't actually do anything to discipline children. It's a 'social experiment' that has failed and I'll leave it at that.