I do not know if this gives you any help, but my grandfather James Kee died in Bridgetown Urney Parish and buried at the old COI cemetery in Castleberg in 1886. James Kee was a carpenter and do not think he farmed.
There is a M'Cay listed in Griffiths Valuation in 1860 along with James Kee and Robert McFarland. McFarland's daughter Jane married James' son William. I would check other valuation records to follow where they lived in Tyrone Co. Betty