A spy cam isn't the answer to all of your problems. But it will give you a glimpse of what happens in your absence.
Lucky for you, there are many different discreet spy cams available. You don't need to use a fluffy pink bunny stuffed with a camera.
However, your choices are limited by circumstance. Many spy cams would be difficult if not impossible to install.
You'll find smoke detectors, thermostats and signs containing spy cams. These are great for your own home or office. But, you can't put them in a nursing home.
There are also cordless phones, pencil sharpeners and can openers with spy cams. These items would seem out of place in your father's room.