If you're a web programmer, then the easiest way is to do an HTML5/Javascript games. That's the closest to what you already know. Get him some books on html5

If you're a web programmer, then the easiest way is to do an HTML5/Javascript games. That's the closest to what you already know. Get him some books on html5 and javascript, or good web-based resources. Make a simple game with him, like minesweeper or Tetris. Also, if you make an HTML5/Javascript game, you can use something like PhoneGap/Cordova to compile it to a mobile app.