I don`t know if this is of any use, but I don`t think the Owen Jones 1815 is connected.
He lived at Quirt, Dwran and was obviously a farmer.
Any way with lots of time on my hands I used the Tithe maps to try to locate the place names you mention.
It doesn`t really help with the family , but nice to see where they lived and if they were landowners or occupiers. Problem is they could be different people with the same name.
So using your info that the 1760 – 1844 Owen Jones was at Tafarn Tusw. He died at Twddyn Hwrdd
https://places.library.wales/ Using the tithe maps and searching for Owen Jones in Anglesey gives hundreds of results. By narrowing it down to Llangeinwen I found one that might be yours.
Map Name Llangeinwen Field Number 127,134,146
Field Name
Tyddyn r hwrdd . Landowner Mr Owen Jones
Occupier Owen Jones Area 2A 2R 4P Tithe Value 11s. 6d.
There are two plots for
Tafarn hwsw , but on the map there is a Tafarn Hwsw fach ( small) and Tafarn hwsw fawr. (big)
Choose the View Apportionment then scroll through the pages.
Page 6 number on plan 47
John Owen Esq landowner. John Parry occupier Tafarn hwsw fach
Page 7 number on plan 48
Thomas Peers Williams Esq. Landowner. John Owen occupier Tafarn hwsw fach
The maps seem to have been done in December 1840.
I did some of the transcribing myself and really enjoy using them to find where ancestors actually lived.