Margaret was born in 1903. She passed away in 1981.
Sources
Granddaughter. Janet O Sullivan
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DNA Connections
It may be possible to confirm family relationships.
It is likely that these
autosomal DNA
test-takers will share some percentage of DNA with Margaret:
"Ireland Civil Registration Indexes, 1845-1958," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:FB28-HT5 : 9 March 2018), BIRTHS entry for Margaret O'Mahony; citing Cork, Oct - Dec 1903, vol. 5, p. 87, General Registry, Custom House, Dublin; FHL microfilm 101,069.