Unpopular opinion: Pressuring / "convincing" non-technical family members into using Linux is bad behaviour. It means that family member is now beholden to you. They almost certainly don't know anyone else who knows anything about Linux, so when they have problems - and they WILL have problems - you are the only person they can turn to. You are giving yourself power over them, essentially for the sake of your own vanity.
@hedders Who do you thing they turn to with their windows problems?
Soon EOL Windows 10 problems for that matter.
"You've got problems with your Windows? You're on your own. Install linux, then you can come to me for help. And not centos or ubuntu!"