edit: Im not trying to be snarky, I think your reply was genuinely trying to be helpful, but its not ok that we're being sold this crap
Some effort's needed to clean up the homescreen, but you never need to see it. Hand your grandparents a basic programmable remote without extras like the home button. They should be good to go.
Yes, it is technically possible to de-fang some TVs, but it should not be necessary.