I suppose it would be OK, if it helps teach him to read & type. I'm a bit self-conscious about my DnD habit, and only play online. I know my wife would be less than thrilled to see our kids pick up my gaming hobby. We'll see. Certainly we'll do lots of other gaming like chess, backgammon, risk, monopoly, scrabble, bridge & such, which I also love. Not to mention some good strategic computer games, like Age of Empires...
In any case, hope you keep your job.