Hi Jocelyn,
1891 census
103 Station St North, Cadoxton Juxta Barry
David Davies, head, m, 26, coal trimmer, b.Glam, Peterstone, language = both
Margaret Davies, wife, m, 25, b. Glam, Llantrissant, language = both
John Davies, cousin, unm, 25, coal trimmer, b. Glam, Perterstone, language = both
RG12/4406 : folio 104 : page 48
Registration District : Cardiff
Sub Reg district : St. Nicholas
hope that helps,
Chris
*edited to correct an appalling typo!*