Hang in there Al....with all the good juju around here things will be fine. God bless your Dad...he sounds like a fighter!
You are being a great son......just dont go so far as to neglect yourself if you need that surgery.
Your Dad sounds like he is in good hands, and you wont be able to help him if you are in pain or sick yourself. Just dont wait too long.
As far as family leaving....its tough when family members live far away....My old man missed his own mothers funeral because he was ill and couldnt travel....probably broke his heart. Your brothers probably have lives back home and they dont mean to be cold....it is probably hurting them more than you know.....but its tough being the only family aroundwhen another family member needs help or support....a lot of pressure, it is.
Just do your best....sounds like you are!