Lillian Adams Grimshaw was born on February 24, 1912 to Hugh Leech and Barbara Matheson Adams in Parowan Utah. She attended grade school in Parowan and later attended the Branch Agricultural College in Cedar City, Utah, graduating as valedictorian in 1932. She taught at West Elementary school until she married Franklin Hunter Grimshaw on May 16, 1934. They were later sealed in the Mesa, Arizona Temple in 1936. In 1942 they moved to Enoch, Utah. Together they had eight children.