Thank you for the information and ideas that you have shared. Recently I viewed the death certificate for Francis and discovered that his parents names were Peter Neaton and Mary Ann Kennedy. While the Neaton surname is relatively rare, the Kennedy surname is ubiquitous. Yet, Denis Neaton married a Mary Kennedy. Other Kennedy's Martin, Bridget, Anne and Ellen appear on birth and marriage records as sponsors and witnesses, while Daniel Kennedy was lessor to Mary Neaton on the Griffith record that you shared.
A final question; am I likely to find more details by checking parish records in person?
Thank you again. You have been most helpful.
Dan Neaton Ann Arbor, Michigan