John's birth date of about 1830 is estimated based on birthdate of wife in 1831. His parents are unknown at this time, as well as his actual birthplace which probably was not in the United States. (See research notes below) He passed away before 1880. His life Isabella is listed as a widow on the 1880 census.
"New York, New York City Municipal Deaths, 1795-1949," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:2WT2-C5Q : 20 March 2015), Isabella Jarrett in entry for Sarah J Masterson, 15 Jan 1944; citing Death, Brooklyn, Kings, New York, United States, New York Municipal Archives, New York; FHL microfilm 2,166,406.
This notice states that her father was born in Ireland.
↑ "United States Census, 1880," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:MZ65-3JZ : 24 December 2015), Isabella Davis, New York, New York, New York, United States; citing enumeration district ED 466, sheet 506D, NARA microfilm publication T9 (Washington D.C.: National Archives and Records Administration, n.d.), roll 0889; FHL microfilm 1,254,889.