The original attestation papers are available from the Library and Archives Canada, and can be found at www.collectionscanada.ca
In the Blairgowrie High School Register, David is listed as being the son of Thomas Doig, Balmoral Road, Rattray. He was born on 5th August 1893, and left school on 30th June, 1909
1901 Census
Fearnielea, Rattray, Perthshire
Thomas Doig, head, 44, joiner, b. Dundee, Forfar
Helen Doig, wife, 44, b. Rattray
James Doig, son, 18, joiner, b. Rattray
Thomas Doig, son, 16, joiner's apprentice, b. Rattray
Helen Jane Doig, daughter, 12, scholar, b. Rattray
Elizabeth Doig, daughter, 10, scholar, b. Rattray
David J Doig, son, 7, scholar, b. Rattray
Mable M Doig, daughter, 2, b. Rattray
Infant Doig, son, 5 days, b. Rattray