Bob wrote : "JAMES ADAIR was supposedly born c.1724 Ballynahinch, Co Down (Northern Ireland) and married an ANNE CLELAND. James and Anne Adair supposedly had5 children, being WILLIAM ADAIR, ROBERT ADAIR, JOHN ADAIR, LAVINIA ADAIR, and ELIZABETH ADAIR. I say supposedly because the information on this generation comes from James B. Adair's 1924 book on the Adairs. The next generation is pretty much accurate. William Adair left Ballynahinch before 1790, as he shows up in Pennsylvania census at that time.
According to family tradition 5 known and one unknown children remained in Ireland.
William Adair married an ESTHER SMILIE. Children of were; 1. ELIZABETH ADAIR, married ANDREW FRAZIER, latermoving to Brown Co Ohio 2.ANNE ADAIR, married a Mr. BLACK and remained inIreland 3.JOHN S. ADAIR, moved to Salem Twp, Westmoreland Co,PA (from Washington twp ?) 4.James Cleland ADAIR, came to USA in 1803 fromBallynahinch as evidenced by naturalization papers. Married Belinda Jones of Maryland, settled Fayette Co, PA later Jackson Co Ohio and Jay Co In. 5. Patrick ADAIR, left Ballynahinch 1803 with brother James as evidenced by naturalization Paper. Went to Fayette Co Pa. Married 1stly Margaret Stuart / Stewart, m. 2ndly Anne Anderson,3rdly Anne McCracken. Moved to Wayne Co Ohio in 1825. 6.Unknown"
Would there be more information on this family in the "J.B. Adair book" ? Sorry cannot be of more help, but perhaps others in America and Ireland researching this lineage may be able to assist.