Andrew Hanson & Mari Lien Olson

I am looking for information on Andrew Hanson born 10 Jun 1843 outside of Olso, Norway to Hans Olsen or Tangen and Berta Olsen or Tangen . I have two family records one indicates his father's last name was Olsen the other was Tangen. He left Norway around 1870. Andrew possibly had a brother named Bernt. I am also looking for more information on his wife Mari Lien Olson born 3 Sep 1853 in Gudbrandsdalen, Norway. Her parents were Esten Olson and Marit Christens (Christendatter). She left Norway around 1873. Thank you in advance for any help you may be.