Hi Bob,
"Been there, done that" hardly seems like serious response to your situation even though it's true. The road seems hard, and it is, but it's one we all have to travel sooner or later. Our parents are one of the most va;uable relationships we have, with the children being the other. Scripture tells us to "honor our father and mother" and that's where you are and I suspect have been all your life. God will honor and bless you for it even though you do it out of love and respect and not for reward.
With your permission I'd like to put your folks and you on the FCM prayer chain that goes out nationwide. Just let me know if you'd like this by emailing me at wilhint@henry-net.com
Blessings,
Will