Big thank you to everyone who answered
I am staying put for the moment.
I had the conversation with Dp on Friday night. It was not bloody easy, and we both got really upset but he is going to start really pushing social services to help/support us. Not just for us, but to try and make things better for BIL as well, because he obviously is not happy right now either
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Dp has had a chat with BIL earlier, not in 'lyon wants to leave type way' but more in a 'we really need this sorting, it isn't good for anyone' type of way. BIL did get really upset, and did say he is trying at the minuet but promised if Dp arranged some counselling, and attend with him, then he would do his best to talk to them - which is defiantly more than we have had before.
Me and Dp sat down yesterday and went through the whole thread to try and get some practical advice. As I said, he is talking to social services and is going to say we are tempted to put him in care (even though it isn't true) so they do something. He is also going to ask about respite care (but maybe once a fortnight or something, rather than every weekend) and is going to put the idea to BIL in a 'it might be a nice break for all of us' so he doesn't think we are trying to ship him off. Dp is also going back to the GP to try and see if there is anything they can help with, and is going to be a bit more forceful.
I will try and some questions so to the poster that said about school, he is on some sort of plan and will be going to a specialist school now (a Pupil referral unit I think?) as his current mainstream school do not want him back (told us on Friday).
Also, to people that said about hobbies, he doesn't have many but he does do mixed martial arts (when he turns up), and likes drawing. He tends to watch a lot of tv/films in his spare time. He doesn't have a lot of friends at school (he can be quite difficult and flip so I think it puts people off). There are kids he talks to in school, but not out of school.
Also him and Dp do quite a lot of things together. They don't do stuff all the time (as there are our two boys as well), but he does take him football, the gym (when BIL will go), and they also watch tv together as have similar tastes. Dp also spends a lot of time just talking to him, which is nice. He also sleeps in his bed, usually twice a week, and they read together then (BIL can't really read very well, so Dp usually reads to him)
Thanks again, I think this was really the push we needed. Dp was reluctant to really push for support before as he doesn't want to give up on BIL and didn't want to be in the position where he was saying he was considering putting him back into care (even if it isn't true) just to get the support. However, reading this thread has really helped us to push for this support. I know we don't have it yet, but I am hopeful and maybe this will improve things
So thanks again 