Larson's from Norway

My fathers name was Arthur Carl Larson, b.oct.17,1920, in Muskegon Mi., d Apr.9, 1996. He and his brother, Lawrence Henry and sister Martha were abandoned in Muskegon, Mi. when they were small children. His fathers name was Carl C. Larson b. Jan. 20,1881, in Norway, d. Dec. 11,1953in Muskegon, Mi. . His mothers name was Elsie Christiansen (Swedish, I think) Larson of Muskegon, Mi. Carl came to the U.S. with his parents John and Martha (Christoplsen?, Christoferson? Christiansen? Christ??????? not to sure) Larson when he was about 4 yrs. old. John and Martha's children were Minnie, Martha?, Matilda, Carl, John, jr. and Martin. I'm not really sure but for some reason I think they were from Oslo. John and Martha came from Norway to Washington State, Idaho, Ohio and finally to Muskegon, Mi. Could any one please help me find any information concerning these Larsons? Thank you, Diana Larson Sonntag