When Bertha Glenn Lamb was born on 28 August 1882, in Tennessee, United States, her father, Robert Fletcher Lamb, was 23 and her mother, Harriet Alice Gallaher Lawson, was 21. She married David Madison Jefferson Roberts on 17 October 1909, in Craven, North Carolina, United States. They were the parents of at least 2 sons and 2 daughters. She lived in Asheville, Buncombe, North Carolina, United States in 1930 and Hot Springs Township, Madison, North Carolina, United States in 1940. She died on 7 August 1949, in Knoxville, Knox, Tennessee, United States, at the age of 66, and was buried in Paint Rock Cemetery, Paint Rock, Madison, North Carolina, United States.