Time to let go

It’s hard to see my dad in so much pain. I’ve always struggled to form a relationship with him because he would be out of it from his pills or just in a lot of pain. I’ve gone back and fourth between being resentful that we don’t have a relationship, to mad about judge mental things he’s said, but seeing him separate his pills from 10 pill bottles into his daily box and going down stairs to get his box of fentanyl patches because he can’t go down three flights of stairs was tough. I think it’s time to forgive him but I don’t know how.