I know it must be difficult
@hipster333 but you may need to refresh dad's memory on THR recovery.
It sounds like you're still requiring a measure of rest and recovery after each days work. To be expected.
It's not your fault that your dad chooses to be anti-social. I'm sorry you feel that extra bit of pressure to keep him happy or entertained. Taking him in is very loving and extremely generous but also a large commitment in itself. Not to mention a shift from the normal family dynamic.
Personally, I give you credit. I can't imagine going through recovery with three young kids and all the demands involved, getting them ready and off to school, getting yourself ready and off to work then coming back home and feeling pressure to show your dad some love amongst any household duties you're engaging in. Cleaning, tidying up, laundry, meal prep, chauffeuring kids. You have a lot on your plate and you need to take care of YOU in all of this or you'll be no good for anyone else.
Consider a family meeting explaining that you need help, cooperation and a little space to rest as you are still recovering from a major surgery. Especially in light of the fact your husband will soon be away for three weeks. I'm concerned about you getting what you need as you recover. Hoping that all falls into place for you soon.
Wishing you a peaceful, relaxing weekend!