Wow, I'm getting really confused now

(nothing new there!)
Let me get this straight:
In
1911 we have
Joseph BAPTIST. Head,32. M. Coachman (travellers) Bishopsgate St.
Emma BAPTIST, Wife, 43, M, 10 yr., Tower Hill.
Fred BAPTIST, Son, 9, Pimlico.
at 21/2 Block Sutton Street.
Working backwards, in
1901 we found
22 in 23 Little Sutton St, Clerkenwell, London
Elizabeth BAPTISTE Head Widow 50 Book folder Worker London, Southwark
Joseph BAPTISTE Son Single 21 Mail Driver Worker London, Bishopsgate
Frances HOWES[?] Sister Married 48 Laundress Worker London, Southwark
Backwards again, we have so far got no potential candidates for 1891 or 1881 for Joseph.
We do have possible parents in various years but none that seem to match 100%.
I think rather than working forwards from a marriage for people who may or may not be Joseph's parents, it would be better for Osborn to buy the birth cert for the Joseph James BAPTIST in 1880 to try to confirm parents that way (sorry Osborn, when I suggested this earlier I didn't notice you'd already found the ref for that cert).
Cheers
Prue