Hi Worser
To start off - is this your couple in 1871:
1871: Bromley St Leonard LondonEcclesiastical parish: Bromley St Michael
RD : Poplar , Sub-RD: Bow
REF: Class: RG10; Piece: 572; Folio: 85; Page: 6
ADDRESS: Brumsnick Road
Head: John JACOBS 27, Stoker Steamship, b Stepney MDX
Wife: Emma JACOBS 23, b Bromley MDX
Dau: Phoebe E JACOBS 2, b Bromley MDX
Son: Arthur J JACOBS 8 months, b Bromley MDX
So, John born approx 1844
Emma was born 11 Sep 1848 (IGI)
Which Census do you already have Emma's side in (not 1848

)
Cheers
AMBLY