May be a little serendipity here, I was just at Folk Music Index to Recorded Resources at John Hopkins University in my search for lyrics for the the Prune Song and came upon a song called The Prodical Son recorded by Doc Boggs on Verve/Folkways FV9025 (197?) cut#10 and also a song recorded by Uncle Dave Macon Vol 2 Vetco 105 LP (197?) called The Prodigal Son's Return. I have no idea what the lyrics are but it may be a start in the right direction. The site is at http://milton.mse.jhu.edu:8001/research/folkindex/index.htm.