Michael was born about 1897 and passed away about 1950
Sources
Pennsylvania (State). Death certificates, 1906–1963. Series 11.90 (1,905 cartons). Records of the Pennsylvania Department of Health, Record Group 11. Pennsylvania Historical and Museum Commission, Harrisburg, Pennsylvania.
Find a Grave, database and images (https://www.findagrave.com/memorial/155694135/michael-j-mahoney: accessed 9 July 2023), memorial page for Michael J. Mahoney (1897–1950), Find a Grave Memorial ID 155694135, citing Saint Charles Borromeo Roman Catholic Cemetery, Drexel Hill, Delaware County, Pennsylvania, USA; Maintained by Terri McFadden Wisniewski (contributor 47980200).
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DNA Connections
It may be possible to confirm family relationships with Michael by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
Y-chromosome DNA test-takers in his direct paternal line on WikiTree: