I have been told my 3rd great grandparets were James Duffy and Catherine Sheridan (I have no additional info on Catherine). They were married in Kilconduff, Swinford, January 6, 1814. Catherine might have been a cousin or sister to your James. Per the tithe applotment, in 1833 there was a Thomas Sheridan leasing in Kinaff, Kilconduff. Per the Griffith Valuation, in 1856 there were James leasing land in Treanlaur, Thomas and James leasing in Knockbrack, and Thomas and James leasing in Kinaff.
There is a tree on Ancestry with a James Sheridan born about 1810 in Swinford. He married Eleanor (Ellen) Durkan of Swinford February 20, 1830 in Swinford. Records of children baptisms show both Kinaff and Knockbrack as addresses.
Not sure if this helps.
Regards- Mary