What's the morality of caring/not caring for neglectful parents in their old age?

It sounds like to me that you chose someone else over your parents. And what was it your parents did. Oh they objected to your choice. I think you should all forgive each other and start over now. Yes you have a moral responsibility to provide for your parents in their old age. Time is short, so I wouldn't wait long. You don't know how long you will have the opportunity to make amends.