Additional info: I have traced back via the 1880 census to discover that Patrick O'Hearn (b. 1820 in Ireland) and Mary (b. 1826 in Ireland) lived in Eldorado, Fond-du-Lac County, Wisconsin at least from 1856 on. They had seven children while living there: Dennis Martin (b. 1856), Sarah (b. 1858), Thomas (b. 1860), Maggie (b. 1862), Ellen (b. 1865) Mary A. (b. 1868) and Katie (b. 1872). Dennis is my wife's great-grandfather. He married Florence (don't know her maiden name) and had a daughter Grace Margaret O'Hearn about 1895 and moved to Tampa, FL about 1921. Grace had a daughter Florence Ann (b. 1821) and son Dennis (b. 1922) who is my fatehr-in-law. I've made it five generations to my wife's gg-grandfather. And I suspect he came here via Canada from Ireland early in the famine.