Trying think on it from the perspective of someone who feels trapped in an abusive relationship.
So, you might feel an overwhelm of guilt and shame that kind of, freezes you. A feeling that you are somehow responsible for the abuse, a guilt about removing him from your home because perhaps he has no where to go. A fear of upending the lives of other parties involved. A worry of the unknown of what's to come if he leaves.
First off, whatever happenes to him onces he's out is not your responsibility. If he didn't want out on his arse, then he shouldn't be a woman abuser. You are not responsible for him. Do not let him try guilt you into thinking otherwise.
Secondly, for any child involved, the best thing is to get this man out asap. Yes there is be some turmoil but, thats far better than continuing to have this volatile person in their home. After a week or so with them gone, your child will be glad of it.
Thirdly, it is not your job to protect this man from the law. If he threatens women, there should be record of this so that you and, other women can be kept safe in future. He is BAD enough for the police to get involved and your saftey and your child's saftey is at risk if you don't contact them.
If he leaves yes you may have to make other arrangements regarding your disabilities. It may be complicated for a while. But I can promise you this, your life will be better without him in it. Your sons life will be better too.
Abusive men do not belong anywhere near us.
His behaviour is not your fault.
You aren't responsible for him.
You are responsible however, moving forwards for your saftey and that of your child. There is a man in your home who has made threats on your life. Go.to.the.police.