looking for family information

I am new at researching my family information. I am trying to find information on my family they came from Norway in the 1900's. They had 8 children that came along. My great grandpa was Anton Johaneson Rismoen Born March 25, 1863 in Efterlot Sansver Norway. The information on parents that we have for him is Father Nils Nasser born 1825 Died 1900 est. Mother Maria Born 1840 Died 1905 est. He married Karoline Bredine we have to diffrent last names for her Hofslia or Hoff on June 4, 1886 in Sansver Norway. Her father is Ole Andrisen Hofslia or Hoff and her Mother is Marie Andrine Halvordatter Braaten. She was born January 19 1868 in Efterlot Sansver Norway. In the 1900 census they lived in Sansver Norway and the children had the last name Antonsen and Antonsdatter. We have been told that they had a daughter in 1900 and she passed away in 1901 and is buried in Sansver Norway. We can not find any information on her. Any information would be a great help. Thank You Brenda