My brother is on the autistic spectrum and is 20 years old, he's not severe but I woudn't exactly call him mild either. Right now his behaviuor is just out of control. It would take too long to go into it but hes constantly swearing at my parents and threatening them, making ridiculous demands that we must all obey in the house otherwise hes very abusive and aggressive. My mum is really ill today and he keeps going in her room swearing at her at random intervals to wake her up and being abusive to her because he thinks its funny and we've been telling gim to stop it again and again but thats eggs him on even more and he starts on my dad too. My dad finally gets angry and threatens to kick him out as this has been building up for a while and my brother goes mental. He starts calling my dad the C word and piece of s*** and starts saying he'll fight my dad and punch him if he threatens to kick him out and starts threatening to kill him. We almost called the police but when we've threatened it before he just says that he'll tell them we abuse him if we ring them and he'll make up a bunch of stuff. He also believes that if he makes stuff up to the police about domestic abuse then he'll get free housing.
We just don't have a clue what to do now, you cant reason with him at all, he is completely uncapable of taking it in, and I genuinely believe that he doesn't understand what he's doing wrong. Who can we turn to? He's currently recieving no help because he completely refuses to admit that he's autistic and goes crazy if you try to suggest it. He's not working at the moment and refuses to look for jobs, right now I just see him living with my parents forever and making them miserabal. What can we do?