Jom, I came across an enigma in the Archives that I couldn't solve and they may not be your relation but I'll post what I've found.
In the Burial records for St Peter Llanbedr Y Cennin the burial record has two graves Plots 155 and 176 for Moses and Anne Jones.
The Inscription is in Welsh on both graves with Latin numerals and on grave No155 the inscription translated is as follows:-
In memory of Anne Jones wife of Moses Jones of this Parish buried June 1st 1848 aged 76.
Also Moses Jones died May 15th 1861 aged 81.
This is the mystery, the grave No 176 is immediately behind grave 155 and has an identical inscription in Welsh and Latin except for the end bit which is:-
Also Moses Jones died May 15th 1864 aged 87
I haven't got an explanation and neither has the Archives so I'm just passing it over to you for your info