on 3 august 1905, at 57, hackett sr married 18-year-old deborah drake-brockman (1887–1965)—later deborah, lady hackett; deborah, lady moulden; and deborah buller murphy—a director of mining companies. they had four daughters and son. hackett senior died in 1916. lady hackett remarried in 1918 and moved to adelaide to live.