Looking for family of Mikkel Johannessen Grondahl

Hello, Can anyone tell me where I might look or help me find information on Mikkel Johansson Grondahl born 16 dec 1833 in Stange Norway. He married Marte Mortensdatter. I have been trying to find who his parents are, or brothers and sisters. Also Halvor Erikson Grundahl. Born 26, Aug 1853 Trysil Norway He Married Mikkels Daughter Marte Grundahl. They were married in Trysil in 1878 Before imigrating to the Us. I would like to find his parents and siblings as well. I seem to have hit a wall. Any help or advice would be much appreciated!