Need help with Olsen tree

Ok this is the first time I have tried to work the family tree on my mothers side. I recently recieved more information but not enough to do a good search. I was hoping someone here might be able to help. Christian Olsen (b. March 22, 1848?) (d. 1895)(I know he was a firefighter in Oslo) m. Jeanette Marie Rustad (b. Dec 3, 1850?)(d. April 5, 1890) They had 4 children Borhild Olsen (b. ????) Gunbjør Olsen (b. ????) (not sure if I am spelling this correctly) Ragnhild Olsen (b. May 24, 1886) Christian Andreas Thorbjørn (b. Jan 13, 1888) (D. 194?) North Dakota before the end of WW2(died of TB) I know this is not much to go on but any assistance would be great. [View image] This is an image of the family I recently recieved from my mother. Christian Andreas Thorbjørn would be her grandfather(??). This photo was taken in 1889.