Hi Gill
I hope this information will be of some use to you. Here is some of what I have located.
Was your Margaret Wynne born around 1812? You don’t actually say in your original post when she was born. The Margaret Wynne I can locate was born around 1812 in Bedwellty, Monmouthsire, Wales (according to census records).
For Margaret’s parents I also find them as being David Wynne (born about 1786 in Cardiganshire and death 10 December 1785 in Monmouthshire) and Joannah Hughes (born about 1779 in Monmouthshire and death about July 1853 in Monmouthshire).
David Wynne’s parents I also find as being David Wynne (born about 1756 and death 8 January 1848 in Monouthshire) and Ann Williams (born unknown, however, death about 1841). This David Wynne seems to have a bit of history with the Calvanistic Methodist Church at Paran built in 1828. The Nathan Hughes you refer to was this David Wynnes grandfather. There is a photo of the sign from outside the church with a little of David’s history – do you have this photo? Not sure if you do or not, however, the one I have found I've attached for you.
All of the census records seem to indicate that Edward was born around 1801 rather than 1798. However, not uncommon for people to be slightly out with the years back then.
Edward Jones died on 19 October 1874 in Monmouth, Monmouthshire, Wales. There is a record in the England & Wales National Probate Calendar (Index of Wills and Administrations) relating to Edward’s will that you might like to investigate. This record might actually confirm his exact date and year of birth as well.
The census records actually indicate that Margaret and Edward’s daughter Sarah Ann was born in Philadelphia in 1834 (not 1837), as in the 1851 census she is already 17 years old. There is also a brother David (10), sister Joannah (4) and another brother Edward Thomas (2). There is also a 24 year old David Jones listed as a visitor (a relative perhaps)?
In the 1861 census there is another daughter listed – 3 year old Augustus (however this could be incorrectly transcribed and perhaps should be Augusta).
Sarah Ann Jones went on to marry a Thomas Morgan (born 1836) and they had 9 children that I can find. Sarah Ann Morgan died around December 1895.
Edward Thomas Jones went on to marry Elizabeth Wynne Morgan (1849-1914) and they had 3 children that I can find. Edward Thomas Jones died in 1925.
Getting a bit late here and I'm falling asleep, so I hope some of this is useful. Drawing a bit of a blank on details for Edward's parents though, but will keep looking for you though. In the meantime, perhaps someone else might come up with something for you.
Cheers
Caryn