looking for brothers of Ole Helset

Ole O. Helseth is my great grandfather. I have found out that his brothers also came to America at some time. They are Rasmus Helseth or Helset. And Ole Elias Helset or Helseth. Their parents were, Elias Ingelbrigts Helseth and married Ann Marta O. Nedre Ljoen 1839-1919. If anyone knows anything about these people or that can help me locate information, I would love to hear from you. [:D] I also am looking for information on Erik Jonsson 1813-1897 and Kristianne Steffensdotter Bjordale 1824-1875 she is from a farm called Vollset. Thank you