Not too sure if you have the census for William but here are some details
1871 census
William Emmott, scholar, male, age 9 born Middlesex Southwark
He was resident at the City of London Orph School
Civil parish: Lambeth St Mary
Ecclesiastical parish: St Andrew
Town: Brixton
County/Island: London
Country: England
Source information: RG10/690
Registration district: Lambeth
Sub-registration district: Brixton
ED, institution, or vessel: 32a
Folio: 62
Page: 19
Household schedule number: 64
1891 census
address 36 Webster Street
Wm Emmott, head, married, male, age 29, railway clerk born London
Clara Emmott, wife, married, female, age 27, born Yorks Bradford
Stanley Emmott, son, male, age 7,scholar born Yorks Bradford
Nellie Emmott,daughter, female, age 6,scholar born Yorks Bradford
Gordon Emmott, son, male, age 4, born Yorks Bradford
Norman Emmott, son, male,age 2 born Yorks Bradford
Unnamed infant Emmott, daughter, female, age 1month born Yorks Bradford
Civil parish: Bradford
Ecclesiastical parish: St Peter
County: Yorkshire
Source information: RG12/3621
Registration district: Bradford
Sub registration district: Bradford, East End
ED, institution, or vessel: 8
Folio: 15
Page: 24
1901 census details
address 12 Norway Street
William Emmott, head, married, male, age 39, railway clerk born London Bermondsey
Clara Emmott, wife, married, female, age 37 born Bradford Yorkshire
Stanley Emmott, son, male, age 17, engineers clerk born Bradford Yorkshire
Nellie Emmott, daughter, female, age 16, school teacher born Bradford Yorkshire
Gordon Emmott, son, male, age 14,railway clerk born Eccleshill Yorkshire
Norman Emmott, son, male, age 12 born Bradford Yorkshire
Louie Emmott, daughter, female, age 10 born Bradford Yorkshire
Ruby Emmott, daughter, female, age7 born Morley Yorkshire
Richard Emmott, son, male, age 6 born Morley Yorkshire
Civil parish: South Manchester
Ecclesiatical parish: Ardwick St Silas
County/Island: Lancashire
Country: England
Source information: RG13/3678
Registration district: Chorlton
Sub-registration district: Ardwick
ED, institution, or vessel: 29
Folio: 12
Page: 16
Household schedule number: 81
Hope this is of some help
Nicky