Lots more info now available. The chorus remains the same but there are two sets of verses.

The Odetta version is from the film I Walked With a Zombie, written and sung by Sir Lancelot and the lyrics concern the plot of the film. There are clips on YouTube.

The 'pappa ain't your pappa' verses were written and performed by Lord Melody (Fitzroy Alexander)in 1962 and have been covered since by all sorts of people from Lance Percival to the Stylistics.