According to his attestation papers dated January 24, 1916 at Mimico Lachlan Beaton of Mimico was born on March 27, 1882 in Renfrew, Scotland. He listed his wife Mrs. Bertha Beaton, Mimico, Ontario as his next of kin. He was a stationary engineer and had no previous military experience. He was 33 years and 10 months of age and stood 5 feet 9 inches tall. He had blue eyes, dark hair and complexion. The little toe on his right foot was deflected. He was a Presbyterian.
In the 1921 Toronto City directory he is listed as living on the south side of Vanevery Street, Mimico.