When Rigmor Sophia Byhrholdt Nielsen was born on 15 February 1896, in Neenah, Winnebago, Wisconsin, United States, her father, Frederick Nielsen, was 27 and her mother, Wilhelmine Marie Byhrholdt, was 34. She married John Quale Peterson on 5 June 1923, in Ephraim, Sanpete, Utah, United States. She lived in Winnebago, Wisconsin, United States in 1896 and Neenah, Winnebago, Wisconsin Territory, United States in 1900. She died in January 1976, in Washington, District of Columbia, United States, at the age of 79.