Pontus & Sofia Mork (Christofferson)

I had a great response to my initial enquiry re ancestors in Norwary on this forum - thanks! I know that Pontus died and his wife Sofia remarried and immigrated with the kids to NZ on the Hovding in 1873. But - as I'm heading to Europe soon - I wonder if they have any family left in Norway - descendants of their siblings perhaps. Any ideas where I could get access to information like that? A long shot, I know. They were last on the Christiana census - the original forum posting is on page 2..... Cheers, Deb