If their use are mostly web browsing, I don’t see a reason why they wouldn’t be OK with it. In 2018 I installed linux mint in my grandparents’ PC, they’ve been using the same install since, not a problem until now. They just use firefox to watch youtube and send e-mails.
To clarify a bit. In the beginning of the year, Brazil has swapped powers, from an alt right wing president to a left wing one. So soon many scandals will unfold.