Getting your food under control is no small thing, specially if moms helping. Nothing wrong with that.
But your aunt is out of line. You're an adult and don't need her approval for anything. Don't let her become a filter between you and the doctor either. Being older, she's probably thinks it's her call even though it is not. Kind of a dirty trick but blow it off. Now is not the time. Just remember what she did and call it good. Your dad doesn't need any family squabbles when he's sick. Or ever, if you can help it.
When you get the chance ask the Doc how well your dad is likely to heal up. He could have many years left but not be as strong as before. Everyone's different, so don't take what I say as anything more than what happens to some people. It's just something that could happen, that's why you need to ask the Doc.