re: Advice for dealing with a loved one who is in cognitive decline?

Some background: my deceased FIL was a retired NYC policeman. He never got a ticket and he kept his retired badge and police brotherhood card in his wallet and knew when to flash them.
When he started getting forgetful, we hid folded papers in his wallet that gave names of his children who could be contacted if he were lost. Similar pieces of paper in the glove box of his car.
Then his driving got bad. We saw him run a series of red lights. (His geriatric physician encouraged him to keep driving.) My husband disabled his car. Not so's you'd notice just popping the trunk. But if he called a mechanic, the mechanic, ontaking the ignition system apart, would find a note why the car was disabled and unsafe at every speed.
Then he forgot where reverse was. My husband got it running and challenged his Dad to back out of the garage. Crickets. They decided it was an unlucky car and he wouldn't drive it anymore.
We bought it from him. It had had three totally new brake jobs in nine thousand miles.
He started putting money aside to buy a clunker, but before that happened he started seeing dead people and the neighbors called the police, afraid there were dead people in the house.
Then he was hospitalized. Died, probably from Lewey Body Dementia.

Good luck, all, know you aren't alone.