This is a new topic so it might be easier to look at it separately from the other Jones descendants.
I have tried to find John Jones b1806. There are a couple of possibilities but the one I have come across might be the same person.
I think the only way to find him for certain would be to get his marriage with father's name of Peter Jones. That isn't likely to be easy and a search of the local registers for a marriage c1826 onwards might find this. That is assuming he married and it was in the Llandudno area.
There is an entry on the 1851 census in 5 Woods St, Birkenhead. The household is as follows:
John Jones, head, married, age 48 Dock Labourer, born Caernarnarvonshire
Elizabeth Jones, wife, age 50, Dock Labourer's wife, born Denbighshire.
William Jones, son, age 15, Sail Maker's apprentice, born Manchester.
Isaac Jones, son, age 14, born Liverpool.
Owen Jones, son, age 12, born Liverpool.
Elizabeth Jones, daughter, age 8, born Liverpool
John Jones, son, age 4, born Liverpool.
Joseph Atkinson, Lodger, age 19, Dock Labourer born Liverpool.
The marriage information for his children might throw some light on the family.
The reason I think this might be him is because of the fact he is shown as born Caernarvonshire; is married to Elizabeth who was born Denbighshire; in the 1841 census at Pwllygwichiad it shows John Jones age 35, born in county; plus an Elizabeth Jones age 35, not born in county. Their ages in that census would have been rounded up, or down, to the nearest 5 years, so it is possible she was older than him. They are both shown as independent. Their relationship isn't shown but it is possible they were husband and wife. Having said this, I think Robert Jones married an Elizabeth, so was she his wife?
There are numerous marriages for a John Jones in the Llandudno area about the time to be expected for John Jones, c1826 onwards. It is impossible to say for certain if any of them could be him. It would need a search of the parish registers to see the father's name.
I cannot find an entry for a John Jones b1806 in any of the later census returns in Llandudno. It could be that he moved away like some of his siblings. Even searching in the Liverpool area it is impossible to say for certain if any of the John Jones could be him as the places of birth tend to be given as Wales, no specific location.
Another avenue for a search would be to see if the mother of Bri Roberts's ancestor would have sought support from the parish for the maintenance of her child. These were called Bastardy Bonds and some survive in the local archives. I don't know what records they hold in the Conwy archives but it might be worth enquiring. The father of the child would have been examined to see if he should contribute to the child's upbringing. The parish overseer would endeavour to see that the burden of the child's needs wouldn't fall on the parish.
Helig.