From FreeBMD it looks as though Violet and Gladys weren't born till after the 1901 census.
I think this is the family in 1891:
piece 3834 e.d. 48 folio 81
21ct 1h Corby St.
(Brightside Bierlow)
Albert BUTT 27 fitter's labourer DOR Blandford
Clara BUTT 23 DOR Blandford
Charles BUTT Son 5 scholar DOR Parkstone
Charles FORD lodger Unm 28 fitter YKS Leeds
and this is the family in the 1901 index as BULL

1901 census
census place: Brightside Bierlow (Sheffield)
Albert Bull 37 Boiler Firer Engine Tenter Silver Refruers Dorset Blandford
Clara Bull 33 Dorset Blandford
Charley Bull 15 Telegraph Messenger Dorset Blandford
May Bull 9 Yorks Sheffield
Albert Bull 4 Yorks Sheffield
Clara Bull 2 Yorks Sheffield
4 year old Albert would be Albert James:
GRO Births DEC Qtr 1896
BUTT Albert James
Sheffield 9c 571
Hugh