Word is that Linux based OSes are for tech savvy people. Truth is that if you need only web browser and sometimes office software Linux is best for your usecase. I've installed Manjaro (but any other one "easy" distro would work too) to my mothers laptop and she got used to it fast and barely notices difference between her laptop and her Windows machine on work. Seems to me like small thing you can do for your parents to keep them safer and more private on internet.