Hi I have 2 boys both additional needs (1 a lot more than the other) when they were younger the only family member that would help out from time to time was their dads mum, not very often though. I know what you’re going through and how hard it is. I even phoned social services in tears asking for help, there really is none, not where I live. Is there any family your side or his side that you could speak to about it? Hang in there you’re doing the best you can in a very hard situation!