Falsely Accused and Taken to Court by a family member

My father took in his sick mother and was taking care of her at home. He was also power of attorney. A family member went after him, had investigators visit the house weekly, due to false claims he was neglecting her. Long story short, they went to court, he lost and temp. POA was given to this family member falsely accusing him of everything. Now, the state is going after him because she stated he took money from his mother. Some money was taken to pay for the caretaking expenses of his mother. And that is all. Is there anything we can do? We feel like this liar is being listened to and believed and we are the "bad guys." Any help is appreciated.