Pontus and Sofia Mork

Pontus Mork (b.1830) and Sofia Mork (b.1832) are my gr-gr-gr-grandparents and resided in Christiana, Norway at the 1865 census. Pontus was born in Sweden. Their daughter Charlotte (b.1860) came to NZ in 1874 at the age of 14, we think by herself. She married here and had six children. I'd like to find out more about the family she left behind in Norway, her parents and her brother Thor (b. 1862) and Anna (b.1864). They don't appear in Christiana in the 1875 census. All birth years are +/- 1 year. Deb