Hi B, you're used to deferring to him, and he's used to it as well. The reason you need legal advice, like most of us, is that you may not have a realistic idea of your entitlements. It can be reasonably complicated, especially with your history of previous separations, you buying him out of the the house and so on. By all means agree to his suggestions, but only if your lawyer advises. He certainly has the option of not using a lawyer himself, and you can use yours to review his proposal.
It might be worth you and your lawyer asking him to only communicate through her, and not directly with you. The emotional blackmail is starting, with the car thing. I wish he wasn't using the children, but he knows that's your weak point.