My hunch is that there may be no connection at all, since Hart seems to be fairly common. However, I am also seeking a Michael Hart, from the area near the tiny "town" of Lislary, parish of Ahamlish, Co. Sligo. There is some confusion about his wife, or possibly wives - either a Clancy, and/or a Healy. Married by late 1830's, or early 1840's. I know of children Patrick, Catherine, James, John and Michael J. Hart, most of whom eventually migrated to western PA. If you ever run across this Michael Hart, keep me in mind!