Hi Elaine L,
Found your Thomas Henry Parker in both 1871 & 1891 census.
1871 he was at home (97 Giants Grave, Briton Ferry) with parents Thomas Parker aged 47, a general lab born in Neath, Glam. Mother Catherine aged 50, born Briton Ferry. Brothers John (23) engine smith, Samuel (14) mason app, born Briton Ferry. Sister Catherine (11) born Briton Ferry.
1891 He was at Briton Ferry as a 27 year old Stone mason, with his wife Annie R aged 25. Born in Chesterfield, Derbyshire. Two daughters, Mary aged 4, born Aberdare Glam & Helena aged 1. Born Giants Grave, Briton Ferry.
Hope this helps you.
Big Al.