You seem to be glossing over a few things. Providing that you do actually want help, here's some things you should look at:
Quote: No, I won’t pay your child support bill, you have to it yourself. No, you can’t sell the extra car you drive because I own it and the agreement was you would not sell it without taking to me first (I’m on the title).
Who pays for this car? You need to give some more info here. Did you get it for him to use? If he's paid for the car himself and you haven't, then you should just do the right thing and sign it over to him. On the flip side, if you have paid for the car for the most part, then put your foot down and tell him to buy it off you. I hope you don't threaten to take it away from him for any reasons?
And the real reason; No, I won't agree with your new wife just because you want me to, if I don't agree with the way she treats your son when it is not healthy nor in his best interest.
So, what happened that made you dislike his wife so much/made her dislike you? Are you arguing with him over parenting techniques? Need more info if you want help here. But it SEEMS like he is trying to move on and be his own parent, without having to refer to you.
My head says, too bad! The child’s mother took him to court and he must pay child support (which is always late) and he has a parenting plan in place to see his son, but he won't talk to anyone and never makes any attempt to see or talk to any of us. We all live in the same city, very close in area.
I agree he should pay child support, BUT, does he have a real reason not to? Does all the money go to the child, and not to luxuries?
Are you also making the effort to contact him (without fighting) and see him regularly as well? Is this possibly related to the fact he seems to be asking you to accept he has moved on (when he asks you to agree with his new wife), but you are not by disagreeing with her?
All of the above is speculation, because you have given so little information, or at least, it comes across as very one-sided.
Well I’m 63 and feel the end of my live coming
Sorry, many many people live well past this age. This line is coming off as a bit dramatic.