Hi DragonT,
Now that's a lot of new info and, as you said, quite a surprise; (putting it mildly). It just shows how much information is out there, if you have access to it and the requisite savvy.
At the time of Sara's marriage to John Jones of Frigan Fawr her father was the tenant of Parciau Home Farm, 600 acres. Her mother's father, Capt. Henry Jones of Llysdylas is buried at Bangor Cathedral and her mother, Sara Emberson, was the daughter of "Landed Gentry" of Springfield, Essex. Regardless of wealth, John dies 9 years later, her son William too.
I see no mention of what happened to her other son, John, but he may have been left at Frigan Fawr with his other 2 half-siblings.
The speed of re-marriage may have had something to do with Robert's own siblings. Their parents had the farm, Hen Siop at Llangadwalader (110 Acres) but the father died in 1849, aged 48 and the mother in 1851 aged 46. None of their 4 surviving children had married but in 1861 we see Robert marrying Sara and his brother David marrying Anne of Bwlan. (David goes on to produce 7 children). A practical solution to get extra help on the farm.
The coincidence of a Kate Ellen Jones marrying a Policeman named Richards and having a child named Ellen was a blow but I'm nonplussed ... these things are sent to try us and I'll re-check my source.
Once again, many thanks for your help.
Regards, Peter.
PS Just had a look at the 1871 for Hen Siop. David and Anne had 6 children at this date, plus 3 domestic servants and 3 farm labourers.
Just checked my source for the family in Eglwyslian, Glamorgan. It's the family of Griffith Richards, the policeman's son from Holyhead. Just a name coincidence after all.