I don’t know what your - and your kid’s - situation is, but I worry pushing Linux onto someone would be counterproductive to getting them to like it.
I only use it because I genuinely like and appreciate it. I’d probably start by getting him interested in it. If he likes it enough then he’ll try and learn more by himself.
I recently got an LLM running locally on an AMD GPU. This was only possible on Linux. Depending on your son, something like that could be a cool way to get him interested.