Looking for Nilsens

My great grand Parents came to New Zealand on the Hovding in 1872, Anton and Oulli Nilsen, they had a daughter Mathilde, there is some confusion over Oulli's name as on some papers it is Oline, I think her surname was Petersen or Pedersen. They left from Kristiania but may have come from Ulsaker. They had a large family after they arrived here, Any information would be greatly appreciated. Maureen Ormsby