I want to make sure I am in my rich uncle's will so I will visit him everyday in the hospital.
That's greedy. Does your uncle know why you visit him?
He's extremely sick; shut up, let me enjoy some time with him, I deserve it.
While I understand the benefits of getting inheritance from your uncle, I don't think that you should only be there thinking about the need to be in his will and instead sincerely be concerned about his health. Why don't you remove that will on your mind, and focus on trying to get your uncle feel better and recover from his illness?
Who cares? He's an asshole who never cared about me until he got sick. So why should I care about him now.
Because he is dying and it is scary to know that you are going to die. You should be there for him during this difficult time, not because you have an ulterior motive.