Norwegian Howicks in America

Hi everyone! I was wondering if someone could help me find out any information on my great-grandfather's siblings. Or, confirm that he didn't have any. His name was Iver Edvin Howick B: 10/17/1874 in Voss, Norway. D: 12/11/1926 in Thief River Falls, MN. His mother was possibly Synneve Olsdatter, B: abt 1846 in Norway and his father was possibly Ivar Iversen Mo B: 1837 in Hosanger, Norway. This forum provided the names of his parents a few years ago and was most helpful with some other genealogical puzzles. Any help would be very much appreciated. Skol Vikings! Angela