Will look forward to Eric's response. In the meantime I spent the day pursuing this and with the help of someone tracing the Byers line in Texas tracked Francis & Margaret Gellings daughter Emaline through from the death of her father in 1898 to her death in 1965 in Texas. In the process, I think I also have a link between Margaret and her sister Olive Qualtrough/Hudgeon who travelled to Wisconsin as a nurse to John Cowley. Seems Emaline (1900 census) first stayed with John Cowley after her Francis' death.
Nearly the end of the year, so all the best to you and others.