Hope this is a lead. I have an Allen Corey born about 1838 in New York (son of John Corey and Mary Travis). He married a Fanny. Fanny had apparently been married to a Ferguson as her two sons were with Allen in the 1880 census Nankin, Wayne Co., Michigan. As I live in NY I haven't had access to any other census records in Michigan so can't help you beyond this tidbit.