1) Teach him power chords, and how to play them on two strings (5th & 6th, 4th & 5th), as well as on three strings (4th & 5th & 6th, and 3rd & 4th & 5th)
2) Teach him basic, easy, barre-less chords
3) Teach him the basic Major Blues scheme, have him play the chords while you improvise over it...