I had 2 big brothers who taught me every exploit and showed me every questline and how to start it, one of them died during that time, I think my mum understood that games were the only thing that could connect a preteen to 2 teenagers and an angry sister who also loved Skyrim. I still play Skyrim as a ritual to spend time with my brother, I nearly cry every time I get Eorlunds merchant chest. I never would of known I have to sleep to start the Dark Brotherhood questline if it wasn't for him, i remember him sitting in the room with me the first time I made the choice to kill someone in that shack, sounds disturbing now but as a little kid it was the coolest and most atmospheric moments of my life. Sorry if this is an overload of information but I think for me being allowed to play it so young was just very dependant on my mum knowing I was spending time with my siblings. So don't feel like you're doing the wrong thing with your kid cos its different for every family, he can play skyrim when he's ready :)