In the 1841 census civil parish of St. Pancras, Ossulstone hundred (Holborn Division), Middlesex, Registration District St Pancras, sub district Grays Inn Lane. Henry Nixon age 45, Middlesex, musician. Catherine [mistake] Nixon age 44, born in Middlesex. Frances Nixon, female, age 20, born in Middlesex. Jane Nixon age 13, born Middlesex. Henrietta Nixon age 11, born Middlesex. Valentine Nixon, male age 5, born in Middlesex. Maria? Nixon, female age 3, not born in England. Sophia Nixon age 2, not born in England.

Listed twice in the 1851 census
In the 1851 census civil parish of Lambeth, ecclesiastical parish of St Mary, Surrey, Lambeth registration district sub district Lambeth first church living at No. 8 Union Place. Caroline Nixon, Head of family, widow, age 43 [the date although clear must be a mistake as John Danby could not be her father and this doesn’t match the 1841 census], born at St Giles Middlesex, school mistress. Daughter Caroline M. Nixon age 23, born Lambeth Surrey, Professor of Music. Daughter Henrietta G? Nixon age 21, born Holloway Middlesex, Teacher of Dancing. Son Eglintine? Nixon age 14, born Holloway, Middlesex, Clerk ?? Office. Daughter Sophia S? Nixon age 12 born Glasgow. Son Henry C. Nixon age 8 Hemingdon? London. Servant Ellen Pursell age 13? born Ireland.

from another researcher
Valentine NIXON at 4 Francis Street, St Pancras
(HO 107 1495 f 740 p54/55
As a Solicitor’s Writing Clerk age 14 born Middlesex, Holloway
He is the NEPHEW of John P WATTS (Conveyancer’s Managing Clerk) and Letitia

also
Valentine was buried at St Pancras on 13 Sept 1852 aged 16 yrs 3 mo, address given as Francis Street.

In the July to September 1852 death index Valentine Nixon, Pancras, London, Middlesex, volume 1b, page 44.