Found them but not in Hackney (written as Burtinshaw)
1901 Census - 31 Cobden Road, Worthing, Sussex
Alfred A. Burtinshaw 35 Jobbing Gardener b. Fulking (or Falking)
Clara Burtinshaw 26 b. Bures, Essex
Winifred V. Burtinshaw 4 b. Worthing, Sussex
Sarah B. Mills 75 Boarder Retired Schoolmistress b. Alresford, Colchester
Lucy Stones 40 Boarder Laundry Assistant b. Cowfold, Sussex
Ref. RG13 - 959 - 110 - 17
Annette