Mary was a daughter of Captain William Littlejohn O'Halloran (c. 1805 – 15 July 1885), Auditor-General of South Australia.
[1] Giles was educated at Clifton College in Bristol and studied Medicine at the University of Edinburgh, graduating in 1882.
[2] He then spent two years in Vienna, studying diseases of the ear, nose and throat under Dr. Ádám Politzer amongst others, returning to Adelaide in 1885.
[5] During his public career he served as: Giles retired from most professional obligations shortly after The Great War.
Giles married Rita Jones ( – 9 September 1907) of "Brocklesby", Melbourne, on 1 July 1891.