Gunnar Olavsson Haugen was a brother-in-law of Knut Eriksson Helland who was married to his sister, Liv Olavsdatter Haugen (1849-1883). In 1871, Gunnar Haugen married the twin sister of Knut Helland, Gunnhild Eriksdatter Helland (1851–1907). Gunnar and Gunnhild were the parents of:
Following his marriage to Gunnhild, Gunnar Olavsson Haugen re-located to Helland and shortly after began learning the art of making violins from his brother-in-law. He became a successful violin maker, winning prizes and medals both in Norway and abroad. When Knut Helland died in 1880, Gunnar took over both the family farm and the fiddle workshop, at which time he adopted the surname Helland. He had the farm for 26 years and then bought a larger farm below Bø Church (Bø kyrkjelyd), now the site of the trade and research center Hellandtunet Forsknings og Næringssenter.
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^Hans Magne Græsvold; Ola Kai Ledang (14 June 2015). "hardingfele". Store norske leksikon. Retrieved 5 August 2015.
^"The Haugen branch". The Helland fiddlemaker family from Bø in Telemark, Norway. 13 September 2007. Archived from the original on 4 March 2016. Retrieved 5 August 2015.