Your last question: Is that correct? is not posssible to give a positive answer too. All the evidence given on this posting comes from written records, thus no oral testimony is possible.
You have to read what is written, research, compare, analyze, and come to a conclusion based on what can be learned.
There is normally no reason to believe that the written info is not correct. Marlene: In your last posting I have to suggest the following changes: The record for Andreas birth and baptism is #75 on page 80 in the Nordre Land 1860-1871 register. His birth is changed to Sept 17. His birth date Sept 17 is confirmed in the confirmation record. His wife was born out of wedlock and the name is recorded as Anna Maria. Her parents were both born in 1849. When Hansine was born they were living at Kværnsveen a cottage place under the farm Gaarder. When Kristian was born they were living at Granvold where Andreas was a leaseholder and he served as sexton/church official.
Martin Nilsen was born on the Skolmen farm Oct 15 1849, his parents being Nils Madsen and Marit Larsdatter. Helene Andersdatter was born on the Harstad farm Sept 14 1849, her parents being Anders Hansen and Mari Nilsdatter.