Brian since you quote from my site and even from my personal copy of Manx Soc vol 15 (tho without crediting it) it may be worth a second look as there you will find a family tree, a transcript of the Manx chapters of Henry's fishing book, a link to an extensive Cadman tree on another site - not quite sure what else I could add. merely entering "cadman" into the on site search engine gives easy access to this free (and advert free) cornucopia of information