When Thelma B Bekkum was born on 19 February 1910, in Belmont, Golden Valley, Montana, United States, her father, Rudolf H Bekkum, was 31 and her mother, Olene Torgersen, was 27. She married Clarence C Dahlen on 18 June 1931, in Coon Valley, Vernon, Wisconsin, United States. They were the parents of at least 1 son. She lived in Hamburg, Vernon, Wisconsin, United States in 1940 and Coon Valley, Vernon, Wisconsin, United States in 2007. She died on 6 January 2009, in La Crosse, Wisconsin, United States, at the age of 98, and was buried in Coon Valley, Vernon, Wisconsin, United States.