Legal Question in Wills and Trusts in North Carolina

I think you posted the question already although you have now changed the facts slightly.

You can do nothing as you do not have control. Either get a power of attorney over your father (assuming he is mentally competent although from your post that is not going to happen) or file a guardianship proceeding and get appointed. Then you can control who your father sees or doesn't see by getting a restraining order if necessary.

You still do not tell me anything to justify your "belief" that these people are stealing. If you had proof, you could contact the police, and it would be up to them to pursue criminal charges. If your father was neglected or abused, then you might also be able to advise the police of that (it is a crime) or to contact the local DHHS department on aging. Civilly, you can do nothing because you are not the guardian or power of attorney. Only that person would have the ability to demand an accounting and sue the prior power of attorney for any misfeasance if they caused any financial loss.

You have been cut out and appear to be angry at that so you are grasping at straws and placing the blame on these people because of your lack of relationship with your father. As painful as this is, your father does not want to involve you and I don't see why this is any of your concern. He made his choices. Now let it go.