I would like to think that my children will always feel like this home we live in will always be their home, but I suppose some day I will feel like you do. It seems like you feel like your son is not family anymore. You don't want him using your car for anything to do with his children. You don't want him having company over to your house. Sort of like he is a tenant instead of a son.
Would it not be better for you to just give him some money and get him out of your house then?

If he is eating your food, using your washer/dryer, driving your car, etc. then he is already costing you money. If you want him and his drama out of your house, then get him out faster by giving him the money. Notice I did not say loaning because you would probably never get it back.