I have found Robert Jones, Bryn y Gwynt, on the 1861 census. He is living in Bryn y Gwynt and this is near to Tan y Wal. He is shown in a household as follows:
Robert Jones, married, age 53, Labourer, born Eglwys Rhos.
Elizabeth Jones, wife, age 59, born Denbighshire, Llansanffraid.
William Jones, son, age 22, Labourer, born Eglwys Rhos.
Jane Jones, daughter, age 11, born Eglwys Rhos.
I wonder if Robert was an older brother of John Jones. This might be worth pursuing and I will later on.
Helig.