Tosten Olson

Is it possible to find the family of Tosten (Torstein) Olson Ingstadkleiv that according to his obituary was born 9 Nov, 1841 at Stordalen, Norway. I have info that his parent's names were Ole and Gulag? Nothing more. You have been of great help for me in finding info on his wife's family. She was Mali, born 27 Jul 1839, daughter of Torger Olsen Osteras. Another family from our town who are family of Anders (Andrew) Lium born 13 July 1869 at Stjordal, Norway, have an obituary stating that John and Anders Lium (sons of Gunder, #788 in 1865 census of 1712 Hegre sogn) were nephews of Tosten Olson. We cannot figure out the relationship. Tosten's daughter married Anders Lium and their son claimed there were first cousins marrying at some point in this family. I know this was common.....Just questioning how? I've searched and searched the census. Thanks again for your help. Carol