You have to give them a reason to get interested in the OS and the programs they're using. I gave Linux a try because I was concerned about privacy and I wanted to use more ethical and user respecting OS and software than what I used at that time. Linux and the FOSS world was an obvious choice for me. Custom ROM on Android was sort of the bridge which allowed me to transition. If it wasn't for that, I would still be on Windows and I wouldn't learn that much on how an operating system works and what differentiate them, aside from the look. The fact they're kids or that they play games have nothing to do with it: a lot of adults don't know either what type of OS they're using, despite it being in their best interest. The problem is that we don't give or show them the reason they should be interested, or at least be curious about it and most of time, before people get a degree, we end up killing their curiosity.
As they play Minecraft, you can advise them to switch to Prism Launcher instead of the minecraft launcher, especially if they mod the game, it's much better for that. It could be a good start.
Depuis que j'ai appris à utiliser des dispositions personnalisées de clavier, j'ai l'impression que c'est le truc niche qui ne devrait absolument pas être niche, mais qui n'intéresse tout de même personne : depuis que j'ai appris bépo (ou ma version modifié béopô) et colemak-dh pour l'anglais, c'est tellement pratique et plus confortable (en plus d'être significativement plus rapide à taper), je comprend pas que les gens ne soient pas tous enclin à changer et qu'on ai pas ça à l'école alors qu'on est de plus en plus à utiliser des claviers au quotidien, y compris les gens qui travaillent dans le secteur ou qui ont tendance à vraiment beaucoup utiliser leur claviers. Honnêtement, ça me tue.