Telling your father what to do...
...is a miserable business.
No, you can't postpone the physical therapist till tomorrow. Yes, you have to drink the Ensure. No, you can't lie on your back for another hour. Yes, you have to go to the doctor's on Thursday. No, you can't skip the morning blood draw. Yes, you have to have the dressing for the bedsores changed now. I know it hurts, but you have to do it anyway.
I know you're tired, but you have to do it. I know you're not hungry, but you have to eat it. Here, let me cut it up smaller for you.