When Kristian Georg Østensen was born on 23 August 1887, in Kongsberg, Buskerud, Norway, his father, Østen Gulliksen Fiskum, was 28 and his mother, Berit Knudsdtr. Aamodt, was 25. He married Anna Marie Bommen on 5 July 1911, in Sandsvaer, Buskerud, Norway. They were the parents of at least 4 sons and 3 daughters. He died on 1 July 1964, in Sandsvaer, Buskerud, Norway, at the age of 76, and was buried in Sandsvaer, Buskerud, Norway.