There would be no way to know for sure if your dad's family has any mental illnesses or not unless you were fully trained to look for the symptoms. From what you describe, it does sound like they could benefit from seeing a therapist for an evaluation. If your uncle is talking about things that are not real, being selfish and greedy and acting strange in general, then that indicates something is wrong. And if your other relatives are talking about evil and saying bad things, that could be a sign that something is wrong as well, though that is less obvious.
It could be that your dad's family was expose to abuse as children and that is why they all have issues. When people grow up with abusive parents, they can develop poor coping skills, personality issues and other emotional difficulties. That may be why all of your dad's relatives have problems.
PS You may want to put my name in front of your question if you are interested in just talking with me. Otherwise, it is fine to leave your questions as they are.
I can understand your concern. Your father's behavior is a bit odd. Being up at night is not so strange, but making sounds like that could indicate either a physical disorder (if he does it a lot all day and night) or possibly a mental health disorder. If he did come from a family where he was abused, there could be anxiety, depression or another diagnosis. It's hard to say without seeing him. But I can understand your anxiety about being around him if his sounds are that disturbing.
I think we need to start a new thread here. This one is getting long. :)