Edvard Jensen

My great grandfather Edvard Jensen was born April 11 1871 near Kristiansund and his sister Anna in 1869. They lost there parents at a very young age. The church in that area caught fire and some years of records were burnt. I have searched the 1875 census for the whole region. I did find a Anna Jensen born in 1869 classified as a lodger with a woman named Hendrikke Knudsen and she was classifed as a city worker in Sorholmsveien, Kristiansund. But nothing else for her. I have even looked at all birth records for most of More og Romsdal. I know in 1890 he left for USA to join his cousin Peder Larson of Tingvoll. I have tried going through Peder's tree to see if I can link one of Edvard's parents and nothing. My other 3 great grandparent had a very good paper trail. Does anyone have any suggestions. Any thing would be appreciated.