Hi Over,
I’m glad to hear that you are ready to take control over your life back from your adult kids!
One thing I must say—if your grandkids are witnessing the verbal and physical(!) abuse of you by their mother, that is child abuse! It’s also very likely that she does the same things to them that she does to you. Your help only enables this abuse to continue. It may be better that the authorities get involved. Skittles is right—you can’t let them think that what their mother does is normal or acceptable behavior. You don’t want them to imitate this in their adult lives.
As to your son—he has been abusive verbally, and he had destroyed your property. I have a really tough question—are you scared that he will hurt you physically if you stop subscribing to cable/internet, talk to him about getting a job, or do anything to upset him? Really think about this, because a plan needs to be made if this is the case.
If you care to, let us know what your plans are.