Britta (Bertha) Larsdt Lillevik and family

My great granmother Britta (Bertha) Larson (larsdt) Lillevik b21 Mar 1861 Norway d31 Aug 1929 - Oswego, OR was married to Oluf Anderson (Swedish) b.4 Feb 1855 - Sweden d 18 Oct 1909 - Oswego, OR they had 4 children all born in Norway Lena Anderson - female married Elling Artzen Orphie Anderson married Carl Connant Thelma Anderson married Chester Lewis and Nita Anderson (Singer married more than once) They emmigrated to USA to Oswego, OR before my Grandfather was born - Frank Oscar Anderson was the first to be born in USA There is a story that the Family Name of Anderson was changed from something like Granada to Anderson when they emigrated from Norway to USA I think I may have found Britta (Bertha) in the 1900 telling for 1235 Voss # 1809 says Bertha Marie Sjurdtr Lillevik I believe the farm name is Evanger SB This is my brickwall Any help would be appreciated