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Records for Kilfian RC parish go back to October 1826 for baptisms and July 1826 for marriages. I searched on the subscription site Roots Ireland and did not locate the marriage record. There were four baptismal records for children: Mary 1827 Catherine 1830 Peter 1833 James 1834.
John was likely born before October 1826.
the Tithe records indicate the family lived in Seeghanbaun townland.