Is your father in receipt of any services from Social Services? If so, they may well be able to recommend and supply something appropriate.
One of the issues in using an Amazon Echo, for instance, is that it would be unwise to rely on it completely, especially in those circumstances where it's failure my lead to significant problems. Yesterday evening, none of my Echo devices would turn the lights or heating on or off. This morning everything worked flawlessly. When it's working correctly it's wonderful but it isn't 100% reliable.
My local Social Services were able to install a reliable communications system where they could speak to my mother, ask her questions and give her instructions, sending help when there were problems. My mother was unable to use a phone of any description or remember that she was wearing an "emergency" button.
I also thought about a smart-speaker / smart device for my elderly Mother. She mastered a VCR and Videoplus in the 1980s, but these days in her late 90s, anyhting that might require a restart, reboot or intervention at all would be beyond her.
I support my mum with broadband, email smart phones, smart tv and tablets. All of which seem to confuse rather then assist; Frustrate rather than liberate; isolate rather than incorporate.
I then bought a DOT as a special offer from Amazon and set it up at my mums house. Having no buttons to press and a myriad of options to help make more and more tailor made to my mum's needs it has become possibly the most wonderful gift I have ever purchased. Ever!
Alexa devices will grow and meet more and more needs - but having something that can turn the radio on, remind about engagements, play music random or by genre / era / name, wake with an alarm / time a boiled egg .....
I HATED everything about Alexa and thought it a totally useless thing. I would now fight you tooth and nail to keep it :)
Hope this gives you some hopeful ideas about buying ANY voice controlled service. CW.
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There are periods when the Alexa cloud goes down. These are relatively infrequent but do happen. Also your relatives broad band is at the mercy of many external contractors. For this reason you cannot use Alexa in a life-critical application.
However, the fact that it is voice controlled with a surprising range means that should your relative have a fall there is a chance that they could summon help via Alexa.
If you add the Alexa Connect module then you can make a receive telephone calls via the landline, including 999 (subject to above paragraph).
The only time that Alexa would come really unstuck is should your relative have a stroke and be unable to speak with reasonable diction.
It you add Alexa sockets to control auxiliary lighting this can be very useful and save your relative tripping up if they have to get out of bed in the middle of the night.
In this situation do NOT use Alexa sockets to control heaters or other high risk appliances.
Your relative needs a reasonable degree of mental ability which could be helped by sticking large prompt boards on the walls.
The new Alexa Show 5 is a fair price and its reduced audio performance not a problem.
The ability to 'drop in' with your relative's consent would be very useful.
I am in the process of setting up such a system for a respected family friend.