Resistant to change is an understatement--if they are anything like m y 92yr. old mother (west virginia) was. She passed in Jan. I was able to get information on resources from The council On Aging in her area. They are good just to talk to. Fortunately, she was able to stay in her house--and she insisted on living alone!
She had a lady who came to the house 2x weekly and did the driving to Dr. and grocery shopping --and some light housework. She got meals on wheels after and emergency surgery for about 6wks.
With your wife and your parents--you have had more going out than com ing in. No wonder you are exhausted.
dandylion