Well, I took RDWHAHB approach. While explaining the various aspects, I kept it all very simple. I made sure to have him taste the DME and LME, smell the different hops as he added them, observe how the wort changed with each addition etc. When we were done, I had him taste the gravity sample to see how sweet/bitter beer is before fermentation.
The two funniest things were when he smelled the hops and couldn't figure out what it reminded him of - after a few minutes he said "Oh, that's it. It smells like dope.". This caught me off guard. The other thing that was really funny was when he tasted the gravity sample - way to bitter for him.
Overall it was a great success. He was already asking when it would be ready to drink - he wants to bring a bottle over to HIS dads house to show off (my great grandparents were wine makers when my dad was a kid). I don't forsee him running out to buy equipment for himself yet, but he was saying that he wanted to brew next time I brew again! Woo Hoo!