Researching 2x great-grandfather Ole Bergersen

Ole was born to parents Berger Halvorsen Svarthagen, b. Dec 1815, and Olianne Nilsdtr Opsahl, b. Sept 7, 1814 in June 1853, Asnaes, Hedmark, Norway. I know he had a sister, Oline Bergersdtr Svarthagen, b. Aug 1855 in Asnaes. She married ......?, children? Ole had brothers Halvor and Nils also. I would appreciate any information on this family. Thank you!