There is a will of John Rees, Farmer of Wayngrychydd, Llanelly. In the will he mentions his wife Elizabeth and children John, Mary, Hannah, Margaret, Cornelius, William, Daniel and Elizabeth. In 1841 an Elizabeth (70), Cornelius (30) and Daniel (25) are living at Gellylusged farm, Hengoed, Llanelly. It is reasonable to assume that Elizabeth, Cornelius and Daniel are those mentioned in the will.
Cornelius is the Cornelius of Ystradvai, uncle of Elizabeth Rees who we have already discussed and from this we have also already established her parents are John Rees and Margaret Samuel of Blaenhiraeth, later Tynyrheol. Therefore, this must be the John mentioned in the above will. Others have said instead that John son of John Rees of Wayngrychydd is John Rees (1791-1864) of Gellygaled, Hengoed. However, I don’t know what this assumption is based on, other than he is of the right age to be John and Elizabeth’s and lived in Hengoed parish, and the evidence already discussed suggests not.
A further attribution is that Elizabeth’s father John is in fact the son another of John Rees of Wayngrychydd’s children, William and therefore that his parents are William Rees and a Catherine James. I can see how this assumption might have arisen as in 1841 and 1851 William was living at Tynyrheol and John and Margaret Rees were living there in 1871. However, there is no indication Tynyrheol passed down the Rees family line as in 1861 as a Daniel Harris a Carter and William Isaac, a Shepherd’s boy were living there. Therefore, again the facts do not support this.
The Daniel Rees mentioned above I think is the Daniel Rees (of Eryos, Clyn) who married Grace Williams. He is of the right age in later censuses and his marriage record says his father was John Rees a Farmer.
Others, have attributed the other children of John Rees of Wayngrychydd to various their namesakes in census records, but I don’t know of what basis these attributions have been made.