Birth, death and marriage records were at the church for the Christians and oral tradition with the Saami. Property was recorded by walls, landmarks and fencelines and was communally recognized; if you farmed moved onto a place a lot of time that became your name. Saami didn't really own "property" AKA real estate. They had customary use that was recognized by other Saami groups and to some degree by the dominant society.
Our family was living on the frontier and mixed it up pretty good, both Norwegianand Saami. There was plenty of space and resources for everyone.