Karen Teodorsdatter Blilie

I am looking for information or family members of Karen and Erik Blilie from Kindred, ND. Karen was the sister of my ggrandfather Martin Flatla of Pleasant Township, Cass Cty, ND. Karen is probably a half sister as her last name is different from Martin's name (Ingebretson) in earlier records. I learned of their relationship from an obituary of Martin that I just received. I have quite a few pictures of the Blilies and had earlier assumed they were friends of the Flatlas.