I agree it's not a perfect solution, but we don't live in a perfect world. Nursing care costs money, which he clearly doesn't have available. I'd like a panic button for my home, just in case I'm home alone with my daughter (or gramdma is) and fall down the stairs. It's unlikely, but it could happen. What's wrong with a device, simple to push, for those cases when 'Daddy fell down'?
With the cameras, a push button and perhaps some kind of wearable tech, I'd say the guy is trying different vectors to keep his family safe within the limitations of him having to work, his wife having periodic seizures and having to look after a child.
A 2 year old is young, but they aren't completely stupid. They would help, and just need the tools to call out for it. It's not lumping them with responsibility, it's asking if they are ok to help.