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An image of the Bishop's Transcript for 1812 can be found at:

https://www.familysearch.org/ark:/61903/3:1:3Q9M-CSJZ-LVZW?cat=409228

Possible relevant entries are:

1812 Feb 21st Wm Jones & Eleanor Jones were married by Banns

and later that year, the baptism:

1812 September 13 Margaret daughter of William Jones joiner of Taldrws & Eleanor his wife

The ancestors of Robert Edwards of Teiliau House appear to have
settled there at some time between 1813 and 1838, judging from the
wills available at the National Library of Wales.

The will of Robert Jones of Teilie bach [NLW B/1813/165] dated 1810
and proved in 1813 appears not to be related. He named his son John
Robert co-executor and residual legatee. Other sons were called
Robert Jones and Richard Robert

The probate of John Edwards of Teiliau Bach [NLW B/1838/149]  (d:28
July 1838) mentions his son Edward Jones of Telia Bach.

The circa 1840 tithe apportionment for Ffestiniog lists Edward Jones
as the farmer of Teiliau Bach with Rev. Lloyd Wynne owner.

This can be seen at the NLW tithemap web site.

https://places.library.wales/

I looked for evidence of the father of John Edwards, who would likely
be called Edward John or Edward Jones or perhaps with some other second
name, but I found nothing persuasive. Your best bet would be to look
through the parish registers and graveyard inscriptions for
Ffestiniog, and then the neighbouring parishes of Maentwrog and
Trawsfynydd.

Possibilites are Edward Jones NLW B/1809/128 of Brynrodyn, Maentwrog,
who died 30 Oct 1809 and is buried at Ffestiniog, and Edward Roberts
of Brynhir, Trawsfynydd NLW B/1809/131.

Two further sources of information about Rev  David Jones of Dwyran
are written in welsh.
Hanes Plwyf Niwbwrch [History of Newborough Parish] by Hugh Owen,
published in 1949, contains a chapter on Capel Ebenezer, a Calvinistic
Methodist Chapel, with a footnote which provides details about the
ancestors of Rev. David Jones. The Newborough methodists first worshipped
at Tyn-rallt the home of his grandfather, John David [baptized 17
January 1725 son of Samuel David and Jane Bonn, at Newborough church]

http://www.tpwilliams.co.uk/newborough/hanes_pdf_ch13w.pdf

There is more at:
Hanes Methodistiaeth Môn  [History of the Methodist church in Anglesey (1851)]
volume 2 page 506 and the following pages. It adds the detail:

After the death of Sion Dafydd [John David], Ty'n-yr-allt, the
religious cause was moved from there to the well-known place of
Plas-Newborough, the residence of the parents of the Rev. D. Jones,
Dwyran, and stayed at there for about 7 years. After that it moved
again to Owen Jones's house, near the village.

https://archive.org/details/methodistiaethcy02hughuoft/page/506

The will of John David 1775 at the National Library of Wales
mentions his three sons John Jones, Owen Jones and William Jones and
one daughter Jane Jones.

NLW B/1775/16 John David; he was buried 21 August 1775.
http://hdl.handle.net/10107/269158

Aerelius s/o Wm Harry Morgan was baptized towards the end
of 1685 at Mynyddislwyn - the day and month are unreadable.

Later references to him in Mynyddislwyn are:

Martha d/o Aurelius Wm Hary was baptized 21 July 1715
Mary wife of Aurelius William was buried 21 October 1751

The father of Aerelius may be the William Harry Morgan
who was buried 15 July 1718.

If they continued to use welsh patronymic names, Martha
would have been called Martha Aurelius and it looks as
if the family used Aurelius as a surname thereafter.

The surname also occurs in the neighbouring parish of Risca
as Relious (1771), Relius (1773), Arelious (1780), Arelius (1781),
Aurelius (1785), Urelius (1788) and Aarelius (1796).