This looks interesting. No 5 Common Road, Penmorfa
Jane Williams 49 Nailer's wife (deserted by her husband is crossed out) b Llanystumdwy
Margaret Williams 10 Daughter b Ynyscynhaian
Robert Roberts 8 Son b Llanfihangel y Pennant
Following Jane back, she was married to an Owen Williams, ag lab. There's a marriage between Jane Jones and Owen Williams in Penmorfa in 1834. If Robert wasn't Owen's son, he might use his mother's maiden name? Not sure where Roberts would come from
Update: I went back to look at this avenue. This Robert has been sitting there as a candidate since the start but the surname and occupation of the father (nailer) didn’t match; however, now that I’ve failed to find a stronger candidate, this one merits another look.
The mother, Jane Williams born 1812, Llanystumdwy, I couldn’t find an exact match for, but there’s a Jane Roberts born 1812 living in Ystumcegid in 1851. Here follows a patronymic system leap of faith: this Jane’s father was William Roberts (from T ceiri griffith’s book) so she may’ve called herself Jane Williams. She appears to have married twice, to a Robert Jones and a William Jones. T Ceiri Griffith’s book says that Jane and william had two sons, a john hughes and william roberts. I’m not sure where the hughes and Roberts surnames came from, it’s a very confusing picture but it might explain why(if it’s the same family) the jane at cennin road had a son with roberts as a surname.
This jane is at Ystumcegid in the 1851 census with the (apparent) sons and by 1861 has left which makes me think that she’s the same as the cennin road one. These locations are about a mile away from each other.
I’ve failed to find, unsurprisingly, the William Jones. T Ceiri Griffith says that he was of ystumcegid and factory Llanystumdwy. Factory was a woollen mill, it might’ve been a former woollen mill even then, it’s a few hundred metres away from ystumcegid but in the adjoining parish. There’s a William Roberts in Factory in 1861, again confusingly, he’s down as William Jones in 1851 at ystumcegid. This is probably not the same william that married Jane, she would be her sister’s son!
This cennin road Robert would make a lot of sense geographically. Cennin road is a couple of fields away from his 1871 location. Unfortunately, I have no further proof.