So there is no chance they have installed keyloggers, or copied out saved passwords?

I would try to save up more money. Maybe ask if any family is willing to chip in as a Christmas gift? It will be well worth the wait if you can expand the budget. 10-15 frames is not a pleasant (or healthy I would argue) experience How old is he?

Dell got some; https://www.dell.com/en-uk/shop/desktop-computers/sr/desktops/all-in-one?appliedRefinements=38623