Would your Adairs be connected to : Martha Adair b. 16 March 1811, Ireland m. 10 Nov 1836 in Ireland, to Samuel McFadden.
Martha Adair had brother, John Adair, blacksmith, of Wolford, Lanark Co, Ontario, Canada, m. 16 June 1842 to Margaret Campbell, marriage performed by Rev. George Romanes, Church of Scotland. Witnesses were William Crosier, lock laborer, and Samuel McFadden.
Not sure if this Adair family and McFadden family is from Cookstown, co. Tyrone, N. Ireland.
In the PRONI freeholder's lists, there is a Samuel McFadden of Cookstown, (co Tyrone) in 1815 with a landlord, Henry or Francis Savage.
In 1821 and 1824 there was a Samuel McFadden in Drumgreenagh (may be in County Down, N. Ireland ?).