July 24, 1823 - November 3, 1877
He married Jane Bowden on 24 July 1823 and they had fourteen children but only five sons and five daughters survived past infancy.
His eldest son was George Wigram Allen (16 May 1824 – 23 July 1885). As Sir George Wigram Allen KCMG he was Speaker of the New South Wales Legislative Assembly from 1875 until 1883.
His youngest son was William Boyce Allen (4 August 1848 – 9 June 1929). He was born at Toxteth Park and was educated at Dr. Pendrlll's School and from 1865 at Newington College at Newington House on the Parramatta River. Following school he raised cattle in the far-west of New South Wales and after returning to Sydney became one of the first sworn valuators under the Real Property Act. Allen and his wife, Adelaide (née Hamburger), had four daughters and two sons.