As I recall, you've posted many times about your not very 'd' p. Isn't he the twat one who wanted to be a rock star professional drummer despite the fact that he can't read music and wannabes are 2 a penny?
If you are who I think you are, you don't get on with any of his family members and you're not accepted by them. His dm in particular loathes you and he has a ds who was conceived by another woman while you were on a 'break' or some such temporary cessation of your relationship with him.
You've posted before about his violence, the derogatory way in which he treats you, his uselessness with money etc, and it's been apparent that, as far as he's concerned, you have been living in a world of your own fond imaginings rather than facing up to reality.
Whatever way you look at it, he's no good to you and it isn't good for your dc to have to witness violent arguments in what should be safety of their home.
Regardless of whether or not he's suffering any mental dysfunction or impairment, your relationship is hell for both of you as well as for your dc and, once again, you're best advised to get him out of your home once and for all.
This sorry state of affairs has been going on far too long; please act now to create the life that you and your dc deserve.