1841 Census Samuel Golding 45 Mary Golding 45 Samuel Golding 20 Anne Golding 15 Isaac Golding 15 Stephen Golding 13 Arsen Golding 10 Caroline Golding 6 Jabez Golding 4 Mary Ann Golding 10 mths
Siblings marriages are on FreeREG also 1845-1856
Maybe Mary Ann ? GOLDING, MARY ANN mmn JAMES GRO Reference: 1840 D Quarter in PONTYPOOL Volume 26 Page 116
There is a Marriage 07 Dec 1780, St Michael, Rudbaxton; Sarah LLEWHELLIN/John THOMAS Witnesses Thomas DAVIES/Thomas LLEWHELIN Bride & Groom signed with mark 'X' (FreeREG)
I don't have access to bapts but there are a couple of JAMES THomas's born c 1786 +/- 5 years on Census who could be marriage witness and possible brother of Dorothy.