Christian Carlson b:1873,Nina Hostvedt b:1878

I am researching my great-grandfather, Christian Carlson, B: 30 Apr 1873 in Kongsvinger, Norway. Son of Mr. & Mrs. Carl Carlson. Christian came to America in June of 1893 (with a group of 19 other people from Norway), and settled in Port Edwards, WI. He had 2 brothers, Oscar & Anton, who came to America prior to 1893. He had a sister who remained in Norway (her name is unknown). He married Nina Hostvedt on 4 Nov 1897 in Wisconsin Rapids, WI. (Nina was born in Norway in 1878, and came to America with her uncle when she was a young girl - possibly in 1888.) Nina had 2 brothers (twins) and a sister who remained in Norway with their parents. I would like to find out more about the families my great-grandparents left behind in Norway. I would greatly appreciate any help I could get. Thanks in advance,