When Millie Reynolds was born on 24 June 1899, in Holladay, Salt Lake, Utah, United States, her father, Victor Cooke Reynolds, was 57 and her mother, Mary Allen Blair, was 39. She married Leland Peterson on 24 June 1920. They were the parents of at least 2 sons and 1 daughter. She lived in Salt Lake City Ward 2, Salt Lake City, Salt Lake, Utah, United States in 1920 and Salt Lake City, Salt Lake, Utah, United States in 1930. She died on 6 March 1988, in Buena Park, Orange, California, United States, at the age of 88, and was buried in Rose Hills Memorial Park, Whittier, Los Angeles, California, United States.