Am I a bad person for this?

I am forgetful.

It isn't any condition I struggle with, but it is something I deal with every day. I just have so much in my head that I easily forget little things I need to do.

So, a few days ago my father fell and dislocated his arm (his dominant arm). He went to the hospital, and the doctor told him to wear an arm sling for around 2 weeks, for the arm to heal.

He doesn't wear the sling. He prefers not to.

One day, while my mother and I were at school (she teaches there), he messaged the both of us saying that his arm has dislocated again.

Since my mother wasn't checking her texts, I told him she was unavailable. He didn't reply me, and I didn't feel that this was a big medical emergency (he certainly didn't really act so when we arrived home).

When we were driving home, I forgot to tell her that he had dislocated his arm.

On arriving, he found out that I hadn't told her about his arm. I understand why he got mad, but I don't really feel guilty about it after he started insulting me.

He accused me of being vain and selfish, and that I only care for myself, and nobody else. He repeatedly attacked me with these accusations, until I stormed up to my room.

I heard him and my mother discussing if he should go to the hospital. They eventually did.

Now his arm is worse and he needs to wear his sling for a month without removing it.

That was yesterday, now he still shows me bitterness. He tries to assert that this is his house and he can do what he wants.

I may be a bad person in thinking this but I wish that his arm is permanently weakened, as it is his dominant arm. Weakened in the sense that he is still independent, but cannot hit things with as much force/ease as before.

I wish this on him because he scared me in the past. On a few occasion, he has hit me before; but not hard enough to actually bruise me. There are also times when I locked my bedroom door, just to hear him beat it while yelling at me to let him in.

This scared me, I still feel scared when I see him at least somewhat angry.

However, not anymore. His dominant arm is injured and he cannot do that anymore.

Am I a bad person for forgetting him? Am I a bad person for wishing harm on him? Please, I want to know.