Alexander, once he was established in the new world, married Martha Moore and had a number of children, including John McClure (1781-?). In turn, John married Ann McFall (1780-1823). The records are sketchy here, so the only one of their children I've definitely identified is hubby's 2d great-granddaddy, Benjamin McClure. (You can visit "Uncle Benjamin's" Facebook genealogy page here.)
My challenge is to see who else might have been in the family of John and Ann McClure. Despite the detailed descendant appendixes in the McClure book, no one knows what became of John and Ann. I know where they died (Adams County, OH) but I just don't know whether Benjamin had siblings. It seems very unlikely that he would be an only child in the 1800s, doesn't it?
With the National Genealogical Society's 2014 conference just around the corner, I'll have a chance to get new ideas from experts in Virginia and Ohio family research. The conference also has a few sessions on Scotch-Irish migration that will arm me with good tips and techniques for pursuing this question.