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Duffcarrick was a small townland. In 1901, there were two families in the townland including Ellen Keane with her children and the John Foley you mention in your message. Ellen died in 1902. In 1911, there were four families in Duffcarrick including Patrick Keane and his family and John Foley living with them. After 1911, information is limited to civil records available for free at www.irishgenealogy.ie
Let me know if you have any questions.