Hans Olsen Strand

I previously requested information on my grandfather Hans Olsen Strand and received tremendous help. Now, I am trying to locate information on his family after the death of his mother, Lina Jonsdatter. According to Statsarkivet i Hamar, a Lina Jonsdatter Opi under Stormoen died Dec. 15, 1872. Nord-Odal parish register listed her as 44 years. Our Lina would have been only 28 at that time. Since Lina's husband, Olof Olsson Opi, remarried in 1874, I assume Lina did die at 28. Is there a different record or could the age be in error? The 1875 census from Statsarkivet shows Ole Olsen and his wife Dortea Knudsdatter and children, which include Julius, Ole and Hans (born to Ole and Lina) and Lina Olsdatter, born 1875. Is there a link where I could get a copy of this census? I have located Julius and Hans in the USA. Is there a record of their brother Ole (born in 1865) emigrating? Statsarkivet said the 1900 census shows Ole and Dortea at Bjornstadholen under farm no. 49/26 in Nord-Odal with their children who were born after 1875. I have not been able to find this farm nor this census and would like to know the names of their children. I hope this is not too confusing. I will appreciate any help you can give me. My sister and I plan to travel to Norway next summer. Any information you can supply will enrich our experience. Thank you. Judy Foley .