I believe it was Brian Dawson who asserted that Delf's offspring, having moved to Lowestoft, altered the song to something like its current form, BUT Ruairidh Greig from Grimsby has done a lot of research on Delf and in fact he died childless. The relatives referred to above might of course be from nephews. The collectors, by the way, were Nigel and Mary Hudleston, now deceased, but their collection was published and is deposited in Special Collections at Sheffield University.