At the time of the 1891 England Census William Mockett, age 18, born in Eastbourne, blacksmith, was with his parents in Ocean Wave, Tower Pl., Eastbourne Sussex.
At the time of the 1901 England Census William Mockett, age 28, born in Eastbourne Sussex, engine fitter's labourer, and wife Eliza, age 27, born in Eastbourne Sussex, were living at 4 Smythes Passage, Maidstone Kent. With them were sons (born in Maidstone): Alexander (1) and Alfred (3 ms).
At the time of the 1911 England Census William Mockett, age 39, born in Eastbourne Sussex, engineer's fitter, and wife of 15 years Eliza, age 37, born in Eastbourne Sussex (mother of 6 children, 2 deceased), were living at 159A Valetta Road, Acton Middlesex. With them were sons (born in Maidstone): Alexander (12), school, Alfred (11), school, Joseph (9), school, and John (5) of Cuddington Bucks.