My father has no feelings for me, never has, but I'm his sole caregiver because of a promise to my mom (deceased). On top of that he's getting bitter, vengeful and sarcastic..He still has authority over his finances and personal life..I'm scared of what he'll sell, give away or throw away when I get out of his site..He pretty vengeful and bitter towards me..What can I do to get some sort of authority on what he can do?..This is a serious situation.. please help!!
If he is not living with you or in your direct care, then I would say to leave him alone.
You cannot control other people.
Leave him to his own devices. He alone gave give POA to someone; getting guardianship through the courts is expensive and onerous. And even if you got guardianship, how would you make him do what you thought best?
You can report what you observe to his doctor, who can call Adult Protective Services; they need to be alerted to the fact that he is a vulnerable adult.
They were extorted. A sick parent says "promise me.....etc." but this is emotional blackmail - you are not really free to say "Thanks but no thanks." So, no valid promise.
The circumstances under which the promise was given have become such that it would be wrong to fulfill the promise. For example, from what you describe he is verbally and emotionally abusive. You have no obligation to put up with abuse. NONE. In fact, you would be doing the moral thing to refuse to go along with it - after all you would not want to encourage and abet your dad, or anyone else, to do something morally evil. So with a clear conscience, step back. You have tried to take care of him, but he is refusing to be reasonable and non-abusive. You have fulfilled any obligation you ever had.
Yes, you promised to take care of him but it takes two to make that work. Not only was that an unfair promise to ask a child to make especially when the parent knew the relationship is strained, but your father wants no part of it. Walk away. You can report to the doc that he has driven you away but you are willing to help when he is incapacitated.