Hello,
Is this the family in 1901 1251/77/26
68 The Crescent, Tottenham
George T Tubman 53 yrs Police Sergeant Pensioner b Ireland
Agnes Tubman 51 yrs b Scotland
John A H Tubman 19 yrs Foreman Dyers and Cleaners b St Pancras
Herbert C Tubman 16 yrs clerk Dyers and Cleaners b St Pancras
Lily G A Tubman 9yrs b St Martin the Fields
Walter G Tubman grandson 10 yrs b Highgate
We aren't allowed to post 1911 information but you could look to Free BMD and Family Search has 1911 indexes
Heywood