Question: What is the date of birth of Brian Robertson, 1St Baron Robertson Of Oakridge's father?
Sentence (from "Sir William Robertson, 1st Baronet"): Field Marshal Sir William Robert Robertson, 1st Baronet, (29 January 1860 – 12 February 1933) was a British Army officer who served as Chief of the Imperial General Staff (CIGS) – the professional head of the British Army – from 1916 to 1918 during the First World War.
Relevant evidence: Yes