Welcome to WikiTree. You probably want to volunteer and tell us a bit about yourself so you can become a member and start entering information. Michael Kelly is, of course, an extremely common name like John Smith or William Miller, so as much information as possible needs to be amassed so that you can judge whether a possible connection is real or just coincidence. Things like a ships name (If he moved to another country) or the names of your wife's aunts and uncles or family occupations or religion may be vital to making a connection.