I am a 2G grandson of Jerome B Dann's brother, Wellington. I have a transcript of a letter written by Jerome to his sister, Demila Bryant Dann in 1896 that I can send to you.
I do not have a confirmed last name for Jonathan Dan's wife, Rachel. (Note that he and the earlier ancestors spelled the name with one "n".) He moved his family of 8 from Duchess County NY to North Norwich during the winter of 1793/1794 traveling on ox-drawn sleds through the roadless forest. Jonathan and Rachel had 7 children (Seth, Abijah, Jonathan Jr., Philip (my ancestor), Betsey, Francis, and Miranda. The daughters married and remained in Chenango County. Francis died as a young man. The remaining 4 sons moved to Abington Township in what was then Luzerne County, PA around 1815. Philip and Isaac later returned to NY founding Danville in Broome County in the late 1840s. We believe Jonathan lived with Miranda's family in his final years.