hi Glyn, I came across this old thread. Did you finish searching for the cil y llidiart family?
It seems that at least three generations were clynnog parish clerks.
One of them was a son in law, William Jones. He married Ellin (ellinor), David Robert parish clerk’s daughter, and the grandaughter of Methusalem grandaughter also parish clerk. Her son Methusem jones was also parish clerk in 1891, then he’s down as a postman in 1901 and 1911.
Working back for william jones: in 1891 at cil y llidiart he’s church sexton, 1881 parish clerk, 1871 and 1861 agri labourer, 1851 shoemaker and 1841, living in Bryscyni with his parents, a shoemaker.
I’m trying to find a Robert Williams (1851 or 1852 born Llanfihangel y pennant or Porthmadog) who is the son of a william jones shoemaker and this William has been named as his father in a family tree created by my uncle 30 years ago. My uncle passed away soon after so I can’t ask him how he made the connection but unfortunately the evidence doesn’t stack up. There is no Robert with this family in the 1861 census. There’s a record of a David son of william shoemaker and Ellin being babtised in clynnog in 1851 but then he disappears from the record.
It sounds like you’re from a different branch but you may have a clue.
thanks