Take care of their parents! Are you kidding? They'd gift Mom and Dad with a membership in the Hemlock Society before ever taking care of them.
(I lost my Dad to Alzheimer's, too, a few years ago. He was also a WWII vet.)
I live 850 miles from my parents and my sister, who is retired, shut down her home and moved in with them to help out. God bless her forever.
My brother, retired Air Force (like me) lives near them and also helped immensely.
I would take a couple of weeks every six months or so as I could without losing my business and go help out.
He passed away at home with my Mom holding his hand while my sister was cooking dinner. I was picking up my daughter from college to get there in time but missed by a day.
He died in the home he built with his own hands with family there. Not in some cold caretaker facility.
I pray that I can do the same when my time comes.