What do I do if my father thinks I hate him even after I told him I don't?

Give him time. Do things he loves to do. Help him with his meds.. let him know that u know about and care for his feelings and that you love him..

Actions speak louder than words. Do some chores for him and write a card. The more you do for him, the more he will realize you really do care.

Let time and your behavior show him you don't. If he continues to think like this, gently explain it is not true. Prove him wrong. If after all Your efforts he still can't understand it, maybe it's not up to you to open his eyes.

You need to talk and sit with him and have a conversation, because as long as you two hold a wall between, things are only going to get worse because he is thinking the problem from his perspective and you are thinking about it on your own way because you two have different interpretations and therefore need to have a good communication to solve the problem. Be the listener and let your father tell what and why he thinks and then you can explain the situation that happened from your point of view. Its important for your father to know that you deeply dont hold any hate against him because it can affect him negatively.

You cannot change what people think. Make sure when you tell him that what he is thinking is not true, be sure to be sincere. If he still believes that you hate him unfortunately you cannot change that.

It all depends on the circumstance- does he have other children that are resentful towards him? It could also mean that he feels he did something that could cause resentment on your end towards him. You can't change your father's thoughts or actions because, sadly, he is an adult. Your best bet is to just treat him as a normal human being. Sometimes sympathy and compassion for human life can change a person for the best.

It must be something you are doing or saying to make him feel differently. Try being more genuine with your emotions

Ask him how his day was everyday, maybe close your phone and sit with him for a few minutes, ask for some life advice. Or staright up go like" dad I get the feeling you think I hate you, I really don't. I'm sorry if my attitude has been bad towards you lately, i'm sorry, love you"

I understand that this can be difficult to handle and may seem impossible at times, but it is not. Often such misunderstandings occur due to lack of effective communication. So maybe communicating the message effectively needs to be done. Also, one can provide constant and unconditional love and concern for one's father. This will help him see that no matter what my child is there and will be there, and so may begin to question his negative thoughts.

It's tough to convince people otherwise especially when they already made up their minds on the subject. In your case, it may help to prove that you don't hate him through your actions. Maybe do something out of the ordinary? In the day-to-day, I'd watch my facial expression/bodily gesture in such a way that they convey you are there for him, until trusts is built. All the best.