Gwil,
Yes, this is the same family!
I have found Thomas 1858 in 1861 living Dinorwic Arms, Llanddeiniolen, parents Thomas and Jane.
1871 Commercial Inn, 1881 School House, Llaneilian, Angelsey, 1891 Llanllechid, 1901 Gerlan Schools, Bethesda.
His grandparents Robert and Catherine Williams, nee Griffith, were my gt.gt.grandparents, Robert was a master shoemaker.
I don't have information on all of Robert and Catherine's descendants: three of their children went to Australia, my gt.grandmother being one, and her story is a very interesting one!
If you are able to give me any more information I would be most grateful.
Diolch,
Glenys