Excellent news. I had nearly given up on Thomas Thomas and his wife Mary. They are not an uncommon names.
And there are a few in Kidwelly in the late c19 and early c20.
I would ideally like to know birth, marriage and death details for the above John and Mary. And Mary's maiden name.
I am led to believe that Thomas the schoolmaster had a brother Daniel who ran a couple of successful emporiums in Aberystwyth in the late c19 and early c20. Daniel became mayor of Aber in 1911, about the time the National Library of Wales was established.
Another relation perhaps a brother of Thomas emigrated to Ohio and it was there where Mary Jane Thomas Northey emigrated with her family to 1910. Mary Jane might be a bit of a railway siding for you ,but if you like genealogical railway sidings, I can help a bit more here.
thanks again for getting my morning off to such a great start!