Hello here are the following entries for the names John and Jemima Bird
No Match to Jemima in 1841 (do you have a maiden name for her?)
There is another John Bird besides this one, but living in Swansea S.Wales c.1811 (not born in Glamorgan) no other matches:
Glamorgan Family History Society 1841 Census CD
District Name: Cardiff Enumeration District: 4 Cardiff
Piece: 1425/03 Folio: 028 Schedule: 192A
Address: WHITMORE LANE
C 21 028 192A WHITMORE LANE BIRD JOHN 27 (c1814)
LABOURER NO
C 21 JONES JOHN 30 (c1811)
NAILER NO
C 21 KELLY MARY 40 (c1801)
- IRL
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2455 1851 CENSUS OF CARDIFF (NORTH-EAST). REF.H.O.107/2455, E.D.4B.
Piece: 2455 Folio: 101 Schedule: 030
Address: SPRING GARDEN VILLA
BIRD JOHN HD M 35 ATTORNEY AT LAW
GLA COWBRIDGE (c1816)
BIRD JEMIMA WI M 35 -
MDX LONDON (c1816)
BIRD JOHN J.S. SO - 10 -
GLA CARDIFF (c1841)
BIRD MIRA ANN DA - 8 -
MDX CHISWICK (c1843)
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Glamorgan Family History Society 1861 Census CD
4032 1861 CENSUS OF CARDIFF ST.JOHN. REF.R.G.9/4032, E.D.7.
Piece: 4032 Folio: 092 Schedule: 275
Address: SPRING GARDEN HOUSE
BIRD JOHN HD W 44 ATTORNEY AT LAW
GLA COWBRIDGE (c1817)
STRUTT MARY A. ML W 76 FUND & SHAREHOLDER
HRT HERTFORD (c1785)
STRUTT KEZIA CL U 41 FUNDHOLDER [
MDX]ISLEWORTH (c1820)
BIRD MIRA A. DA U 18 -
MDX CHISWICK (c1843)
SILCOX JOHN W. VR U 25 WESLEYAN MINISTER
GLS BRISTOL (c1836)
PARTRIDGE MARY SV W 28 DOMESTIC SERVANT
PEM CASTLE MARTIN (c1833)
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John is listed as a Widow in 1861, so Jemima died between 1851 - 1861. I found a death entry for a Jemima Bird on the Free BMD site:
Deaths Jun Quarter 1858
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Bird Jemima Cardiff 11a 160
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I also found a marriage entry for a John Bird a few years after this death entry, could your John have re-married 9 yrs later?
Marriages Sep 1867
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BIRD John Cardiff 11a 371
There are 2 women in the same transcription (it could be the wife of this individual hasn't been transcribed on the Free BMD's as of yet):
Fowler Elizabeth Cardiff 11a 371
Williams Sarah Cardiff 11a 371
If you notice they have a Wesleyan Minister visiting them in 1861 at the time of the census, They were in all probability Wesleyan Methodists.
I hope this helps you
Kind Regards Jen

NB: "This lookup was made using material published by Glamorgan Family History
Society, details of membership and their research service with a full list
of published indexes and transcriptions for sale can be seen on
http://www.glamfhs.org/ "