At the risk of being cantankerous, I have to ask at what point can the 'elderly' no longer think for themselves? Short of dementia, Alzheimer's, or personal safety, why not let us 'old-folks' enjoy what we 'enjoy' doing? How much longer will your Mom or Dad live if you manage to protect them from evil-outsiders, like riding lawm mowers? In the OP's case why not buy her a riding lawnmower with hydrostatic drive, air ride seat, and a sunshade? If the 'old-farts made the money why can't they enjoy it in their 'golden' years? Do you really think old-folks enjoy the isolation of being a couch potato, versus riding around their yard on a '4-wheeler'? Perhaps mowing the grass might give them an excuse to stop and talk with a new neighbor?
I'm not questioning whether children should help parents in need, but I have witnessed far too many instances where a parent dies and self-absorbed, well intentioned, children take over as the head of the 'family' and literally dictate lifestyle and spending habits, and God forbid, sometimes even try to insure maximum inheritance for themselves or their children.
Notice- I was paid to write this ad by old-fart friends who have children