Joseph Peacock (c. 1825 – 25 July 1867) lived at Glenelg and was M.P. for Sturt from 1860 until his death.^[1] He worked as co-manager of Peacock and Son in Grenfell Street,^[2] was a trustee of the South Australian Mining Company and a director of the National Bank.^[3]

He married Harriet Hope Gooch (c. 1832 – 27 August 1854) around 1850. They had two daughters who never survived childhood. He married again, to Maria Houghton (c. 1828 – 18 June 1901). A daughter, Kate Marian Lilian Peacock, married Dr. Harry Swift. Maria Peacock died at her residence "Newland House", 80 Brougham Place, North Adelaide.^[4] "Newland House" was later purchased by Caleb Peacock, and is now owned by the South Australian branch of the Australian Medical Association.^[5]