Born on 10 February 1886 in
New Plymouth, New Zealand, she was the youngest of four daughters. Her father was Clement Govett, barrister and founder of the Govett-Quilliam law firm. Her paternal grandfather was Henry Govett, vicar of St Mary's Church and first archdeacon of Taranaki. Her mother was Frances Elizabeth Atkinson. Brewster's maternal grandfather was
Harry Atkinson, Premier of New Zealand for five terms during 1876 to 1891. A doctor, he had served as a medical officer with the
New Zealand Medical Corps in Palestine during World War I, and was awarded the
Military Cross in February 1918. His grandfather was the surveyor Octavius Carrington, who was the brother of
Frederic Carrington, regarded as the "father of New Plymouth". ==Career==