Posted on: Knox Co. Il Query Forum Reply Here: http://cgi.rootsweb.com/~genbbs/genbbs.cgi/USA/Il/Knox/716 Surname: O'Brien, Sheridan ------------------------- I am trying to find out information on the O'Brien family in Knox county. Matt O'Brien was born in Watertown, New York in 1843. He moved to Knox county before the Civil War. He had sons Frank Fred and John.