Ole Nicholai Olsen, Stavenger, Norway

Looking for any information from Norway or US on ggg grandfather family. The only information I have is that the father of Ole Nicholai Olsen, born November 7, 1856, was Christian, mother Ergena. They came to U.S. in 1871 with four children, two girls, two boys. Ole later changed his surname to Quam in 1910. The family settled in Manitowoc, Wi and later in Sturgeon Bay, WI. Thanks so much for taking the time to help-much appreciated.