Hi Peter,
Found one on 1901 census, when your Ralph was 16, if you think this is the correct one let me know and I will go back further for you.
Father - Ralph Bagnall age 41 b Derbyshire - milk dairyman own account (his own business)
Mother Sabrina Bagnall age 33 b Staffs ? Harborne
Ralph b Oldbury age 16 Bricklayer
Edgar H age 15 occ Fitter
Dinah E age 10 scholar
Dorothy M age 9
Charles H age 7
Francis P age 5
Walter V age 2
Fred V age 7months
living at 60, Edward Street, Oldbury
Ecclesiastical Parish St Michaels and All Angels
West Bromwich, sub district Oldbury
Sue