I have LOTS on this Duncombe family,both descendants and ancestors (back to 1200s Buckinghamshire, England). I also have information on Ann Thomas/Guernsey lineage. Also I have lots on the lineage of Rhoda Tyrrell (including her brothers). Some biographies.
Probably the best way to provide the Duncombe lineage would be to send descendants of the Duncombe immmigrant to the US, then his ancestry in England. Probably Rhoda Tyrrell's lineage, starting with who I have for her furtherst ancestor.
I can send these in rtf format or FTW format (Family Tree Maker), also GEDCOM (which leaves out Fact labels)