Sorry that my post was rather long winded. I agree that John Oldfield married sisters Sarah first then Ann. Ann is working as a servant in the 1861 census
It is possible that John and Ann died pre 1881 and I can't trace Charlotte Malone post 1871 either sadly. I am still puzzling who the sponser George Oldfield might be
I think might be John's first marriage from Lanc Parish Clerks online
Marriage: 9 Dec 1838 St Mary the Virgin, Prestwich, Lancashire, England
John Oldfield - (X), full age, Blacksmith, Bachelor, Whitefield
Betsy Foster - (X), full age, Spinster, Whitefield
Groom's Father: Matthew Oldfield, Stonemason
Bride's Father: William Foster, Weaver
Witness: Alice Hulme, (X); John Scragg
And the only child I can see at the moment is
OLDFIELD, JOHN FOSTER
GRO Ref: 1842 S Quarter THE SALFORD UNION Volume 20 Page 790
At the moment can't see John Snr in 1841 or 1851
Kay