oh gosh J4J This sounds so overwhelming, you poor thing.
(1) I think he needs to get out of your parents' nice house where (I'll bet) he's getting his laundry done and his food cooked. At the moment your mother is doing all the stuff for him that you did. His life is no harder, is it?
I think he needs to BE in his grotty bedsit with nothing in the fridge, doing his own ironing, before it 'clicks' that he's not at home any more.
(2) he shows no remorse because he doesn't feel bad about knocking you unconscious. Because he thinks he ought to be able to do that whenever he likes. Because he thinks he is more important to you and the kids, he is a real person, you are a domestic appliance that he can (a) shag and (b) torture emotionally and physically for his own amusement.
(3) It is tragic that he doesn't want to see more of the kids and doesn't regret the family he lost - but it is not suprising. The kids, you - he doesn't LOVE you all. He loved having control over you all. Now you're not giving him that delicious, heady cocktail of your fear and compliance, what's in it for him, eh? - - this is how he thinks, because this is how abusers think.
(4) I'm sorry that I'm writing this. I'm sure it's very hurtful to read. But you need to read it, because you need to STOP thinking "if I here H I'd be feeling X, Y and Z - why isn't he feeling those things?" and realize that if you were H you'd never knock your wife unconscious and then irritably tell her to get up while your 4 year old clung to her, sobbing.
Sorry, J, he's not a person with feelings like ours. He's an abuser.
(5)Do NOT go into any kind of therapy with him, at all, ever. He cannot change until he wants to change (even then, it rarely works) and he doesn't want to change. He wants his punching bag back and compliant and ironing his shirts.
Go into some for yourself. Are you still going to the Freedom Programme?
Finally, many many hugs for you - well done for getting him out of your house and protecting yourself and your children from this horrible, petrifying man.