MN Hitterdahl family

This forum has been so great, thought I would ask about one more tree branch... Any info on the parents or siblings of : Lars (Sars) Kasperson Hitterdahl Born: Aug 1850 Norway Died: 5 Sep 1934 Thief River Falls, Minnesota, USA Married Gertrude Feragen Born: 1854 Norway Died: 1919 Thief River Falls, Minnesota Children: Elizabeth (Feragen), Sophie (Howick-my ggm), mystery daughter, & mystery son I know that Lars helped homestead Hitterdal, MN with his brothers and then moved to TRF, MN. Any help is extremely appreciated.