Cass married Martha Potter of Ponder's End on 13 March 1823 and the couple had a son Frederick Charles Cass, born at Beaulieu Lodge on 4 September 1824, who was rector of the parish of Monken Hadley in north London and a distinguished local historian. Frederick Cass willed the relevant advowson to his son. Another of their sons, Arthur Herbert Cass, was a Major in the 10th Royal Hussars and fought in the Battle of Chernaya during the Crimean War.
Cass was resident at Beaulieu Lodge, Winchmore Hill, Edmonton, and later Little Grove, East Barnet.
Death and legacy
- Howard, Joseph Jackson, & Frederick Arthur Crisp. (1893) Visitation of England and Wales Vol. I. Privately printed. p. 114.
- The Annual Register, or a View of the History and Politics of the Year 1844. London: Rivington. 1845. p. 160.
- West Middlesex Marriage Index Transcription. findmypast.co.uk Retrieved 23 August 2015. (subscription required)
- The Annual Register, Or a View of the History, Politics, and Literature, of the Year 1824. London: Baldwin, Cradock, and Joy, 1825. p. 184.
- Howard, Joseph Jackson, & Frederick Arthur Crisp. (1897) Visitation of England and Wales Notes, Vol. II. Privately printed. p. 116.
- Hatchments. East Barnet Parish Church. Retrieved 23 August 2015.
- Gove, Brenda R.A. (c. 2012) Guide to the Parish Church of St. Mary the Virgin. Monken Hadley: St. Mary the Virgin, p. 8.