1881 8, Smith Square, St Margaret And St John The Evangelist Westminster
WRIGHT, Thos James Head Married M 30 1851 Carpenter & Joiner East Cowes Hampshire
WRIGHT, Margt Douglas Wife Married F 29 1852 Lugwardine Herefordshire
WRIGHT, Margt Emma Douglas Daughter Single F 2 1879 Westminster Middlesex
WRIGHT, Thomas Cribb Son Single M 0 1881 Westminster Middlesex
SOUTH, Elizabeth D Sister In Law Single F 16 1865 Dressmaker (Unemployed) Woolhope Herefordshire
SOUTH, William Watson Brother In Law Single M 21 1860 Miller (Unemployed) Ross Herefordshire
SOUTH, William T D Nephew Single M 4 1877 Scholar Alrewas Staffordshire
ELLIOTT, Mary Ann E Servant Single F 15 1866 Domestic Servant Lambeth Surrey
HILLIER, John Francis Lodger Single M 35 1846 Printer Compositor Slackhouse Devon
Looks like Elizabeth was another sister and that the family moved from the Isle of Wight after 1861. The Emma E born in 1857 died in Jun 1861, just before the next child was born in Sep 1861, also Emma Elizabeth. There were quite a few Wright births on the IOW, I guess there may be other siblings.
I'll look further tomorrow, but right now I've gone goggle-eyed having done family history all evening!