I guess you have Allen H Bailey on the 1901, as you knew his grandparents names - he's with them and one of their dau's - a 20 year old Mary.
1901 - RG13/897; Folio: 62; Page: 27. - Rotherfield, Queens Road.
Allen is noted as born Rotherfield
I'll see what other kids they had in earlier years, and we may be able to piece together his parents - or at least mother .... but I'd recommend you get his Birth Cert for which Wozzle kindly looked up the Index entry ...