Granpa doesn't need to use command line tools; he certainly doesn't on Windows, even though he's old enough that he might have used MS-DOS or Windows 95 and had

Granpa doesn't need to use command line tools; he certainly doesn't on Windows, even though he's old enough that he might have used MS-DOS or Windows 95 and had to use command lines then. Grandpa just starts his PC, clicks on the Chrome (or Edge etc.) icon, and uses the web. It's really no different for a modern Linux distro like Ubuntu.