If we're blessed to live long enough, we may all have this season to live through.

I had an aunt (unmarried, no children), who in her late 70s, developed dementia. My mom would stay with her for a week at a time after dementia was undeniable. On more than one occasion, she ended up removing the "in floor" heater grate, remember those? She would somehow crawl into the floor heater and couldn't get out. I don't remember the details but when Mom showed up, she would call the great folks at EMS and they would come and rescue and remove auntie from the floor heater which, fortunately, was not during the winter. But EMS told Mom that after about 3 calls, they had to report to DHR as she wasn't able to stay by herself (this was prior to my mom caring for her). Of course, things quickly diminished with her. Her condition was such that a senior alerting device would not have been beneficial. I commend you for thinking of the safety of your family!