Thank you folks again. I will look into all of this. I do have several relatives working on this line in England. I believe they actually can go to the records office and find these documents in person. Perhaps if I send them a list of names and christening dates, they can track down the birth certificates. I can tell you that I've gone backwards in the book of baptisms covering Nevin/Edeyrn area, back to the early 1800 period, and found that David Jones and wife Jane of Bwlch Bridin had about a dozen kids overall, so there are many names and dates to look up.
I am curious David, how did you find out the info on Jeremiah and William? I looked at the website (Findmypast) with the scanned images of the baptism books and pages, where I found all of these kids prior to 1822, and there is no mention of Jeremiah and William in 1832. I know you said they were christened in "Zoar Independent," so maybe the book I was looking at was a different church or religion. That alone leads me to wonder if Jeremiah and William can be from the same David and Jane, since all the other kids were baptized accordingly, in the parish register for Nefyn/Edeyrn.
Also, I noted you actually had birth dates as well as baptism dates. Might these be found on one of the website links you sent to me?
For the record, these are the known children I have for David and Jane Jones, and their baptism dates. All abode locations for each of these were given as Blwch Bridin:
Richard - 22 August 1812
Hugh - 16 August 1814
Mary - 10 May 1817
Robert - 1 March 1819
Elis (Ellis) - 24 August 1820 ** my great, great, grandfather, I believe.
David - 27 July 1822......Buried - 8 December 1832
It's hard to understand why the gap between last child above - David in 1822 - and the latter two, in 1832. You have kids pretty much every other year for ten years and then go ten years without any, and then two more???
William - 20 June 1832
Jeremiah - 27 November 1832
I also have as burial information, the following:
David Jones, Bwlch Bredin, Mariner, 21 March 1842, Age 56
Jane Jones, Bwlch Bridin, Widow, 21 July 1859, Age 73
I know that Bwlch Bridin, as an abode, is actually made up of several houses, clustered together. Someone please tell me that there isn't another one of the same name somewhere in the Portdinllaen/Nevin area. Narrowing this all down to one residence is key, in my estimation, to creating an ironclad link between all of them. I have had another instance, in a different branch of my Welsh tree, where I thought I identified everything correctly based on a residence named Ty Newydd. Then I found out that there are/were about six Ty Newydds in each and every city in Wales! Kind of blew my theories out of the water. If all these Joneses, representing three generations, lived in Blwch Bridin over the course of at least 40-50 years, isn't it rational to expect that they were all related?