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This is the only entry that I can find:
4041 1861 CENSUS OF PORTHKERRY & PENMARK. REF.R.G.9/4041, E.D.8.
Piece: 4041 Folio: 094 Schedule: 017
Address: COTTAGE
REES JOHN HD M 40 AGRICULTURAL LABOURER
GLA PENMARK (c1821)
REES ELIZA WI M 21 -
GLA PENDERIN [BRE PENDERYN] (c1840)
REES MARGRET DA - 12 -
GLA PENMARK (c1849)
REES ELIZABETH DA - 10 -
GLA PENMARK (c1851)
REES MARY JANE DA - 3 -
GLA PENMARK (c1858)
REES CATHERINE DA - 3M -
GLA PORTHKERRY (c1861)
I have looked in the 1851 census for you and there are many Rees entries for the Penmark and Porthkerry area, nothing which looks to be definately this family though.