Hi
Welcome to rootschat
I presume that this is the family you are referring to (1881)
https://familysearch.org/pal:/MM9.1.1/XQQ7-714William Graham 43 bn Hinxton, Cambridgeshire
Sarah A 45 Ipswich, Suffolk
Ethel 12 Notting Hill, Middlesex
Gerard 7 Notting Hill, Middlesex
Annie V 6 Notting Hill, Middlesex
Norah 4 Wandsworth, Surrey
Marmaduke W 2 Wandsworth, Surrey
Birth June qtr 1879
Marmaduke Whitaker Graham
Wandsworth 1d 673
..
In 1891 they have a 20 year old son John with them who is absent from 1881 census