Hi MDW,
This is not much to go on.
I can see this in
1851:
HO107/2466 432 40 & 41
Mathew Street SwanseaWilliam Thomas, head, 56 Potter, b. SwanseaMargaret, wife, 52, b. do.
David son, unm, 26, Potter, b. do.
James, son, unm, 21, Compositor, b. do.
Margaret, dau, 18, b. do.
Elizabeth, dau, 16, b. do.
Edward, son, 12, Errand boy, b. do.
Having another look for other possibles.
Tanja
Can't seem to see any better match