Martin Scorsese's Blues series, depsite it not working as a whole has some good stuff.
I actually liked Clint Eastwood's take the best. Piano Blues. It centers on Piano and gives a very good account of how of Jazz, Barrel House, Stride and Gospel became Blues. He sits with some legends and tells some good stories too. Eastwood may be a good hook for the young kids. It's pretty tame with only one curse from Ray, that Clint repeats .