Looking for video cameras to see how my dad is doing when I can't reach him by phone. Has anyone done this?

There is a app that allows you to use an unused cell phone as a camera setup. That's what I do with my fiance. If I am out and the helpers don't help him answer his phone or if the dogs wait until I'm out to get on the bed I can tell them to get down 😁. It seems like spying but in a good way.

I have used Ring cameras in my home and in my mother's nursing home (under a court order.) There are numerous brands of cameras and services. I think Ring works well. You could set up a few.

Another option, if you have old cell phones -- just install the Alfred app. The phone will then be usable as a camera similar to Ring.

Another option to consider, if you think it would be of use - set up an Echo Show (from Amazon). It would let you "drop in" on your dad and you could communicate via audio/video.

I use a blink camera…..amazon

Yes. I recently put a Ring camera up on a shelf in the family room.
I placed it so I could view him sitting on the couch, when he gets
up, goes to the kitchen table and towards the office.. I also have
one in the front yard to view who goes to the house and one in
the backyard. The one inside can be moved around as you wish.
You can view what he does on your cell phone.

How I wish my folks would let me put up cameras so I could check on them when they don’t answer the phone! We had a discussion and they said they were okay with them until it was time to install them. Then my Dad got angry and threatened to knock them out with his cane! So they sit unused in a closet! So frustrating to be met with resistance when all you want to do is protect them and keep them safe!