 His eldest son Joseph Peacock (c. 1825 – 25 July 1867) carried on the family business and was a member of parliament.His youngest son Caleb Peacock (13 April 1841 – 17 February 1896) was a member of parliament and Mayor of Adelaide from 1875 to 1877, the first such born in the Colony.William and family sailed for South Australia on the "Glenalvon", a ship he chartered, arriving at Holdfast Bay on 28 December 1838.