[Entangled]

Pick an easy language like python, then teach him in order:

    print, print, print
    print, input, print
    print, input, if print, else print
    print, input, for print
    func, print func

These are the basic building blocks of all computer programs in the universe, if he can master them and gets his curiosity in overdrive then he'll be a great programmer, a good skill to have even if he picks another career path.