[2] He married Gertrude Ruth Ince on 24 April 1888 at St Dominic's Priory Hampstead and they had seven children: Zoë Vanda Marie (1889–1978); Basil (1891–1917); Gerard Vincent (1893–1980); Vera Catherine (1898–1993); Yolanda (1902–1919); Denis (1908–1992) and Yvonne Teresa (1913-1988).

[3] His grandson, Basil de Ferranti, was a Conservative politician who represented Morecambe and Lonsdale in the late fifties and early sixties.

His granddaughter Valerie Hunter Gordon invented what is considered the world's first disposable nappy and an early sanitary towel system.

Reportedly, around the age of 16, he built an electrical generator (that had a "Zig-zag armature") with the help of William Thomson (the future Lord Kelvin) and later patented the device (called the "Ferranti Dynamo").

One of the remaining supports of the Deptford Power Station generating hall forms the frame of the sign at the Museum of Science and Industry in Manchester UK, home of the Ferranti Archives.

[3] In 2016 a blue plaque in honour of Sebastian Ziani de Ferranti was installed at 130 Bold Street, Liverpool, marking the place of his birth.