Help in Finding a Marriage Certificate #usa


My paternal grandfather "married" a second woman and lived with her for more than 20 years, had 3 more sons with her and her name in both in the Census as well as the tombstone  has my grandfather's last name. I can't seem to find any marriage certificate. I don't know for sure that he actually married this woman nor can I find that he divorced my grandmother. He just left the family with my 2 Uncles and changed his name from Charles Simon to Charles Hirsch.  I believe he met and "married" this second woman in Minneapolis, MN.  Help would be greatly appreciated.--

Alice Simon Berger