John was born about 1861 (estimate, based on daughter's birth year). He passed away after 1881 (after she was born, estimate).
Sources
Ancestry.com and Genealogical Research Library (Brampton, Ontario, Canada). Ontario, Canada, Marriages, 1826-1939 [database on-line]. Lehi, UT, USA: Ancestry.com Operations, Inc., 2010; Original data: Ontario, Canada, Select Marriages. Archives of Ontario, Toronto : accessed 6 December 2023. Bertha Mary McDonagh; Age: 24; Birth Date: abt 1881; Birth Place: Saint Williams; Marriage Date: 18 Jan 1905; Marriage Place: Port Arthur, Thunder Bay District, Thunder Bay, Ontario, Canada; Father: Jno McDonagh; Spouse: Gerald Arthur Martin. https://www.ancestry.ca/discoveryui-content/view/3495461:7921?ssrc=pt&tid=170557238&pid=222232184790
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