'Gwynfyd Gwaun Gynfi' , the history of Llandinorwig church by Idris Thomas , makes a passing mention to John Roberts (I cannot find any reference to his wife, I'm afraid). It states his tenure as a headmaster was 1900 - 1933, that he was the church's secretary, and that he arrived there from Llanddeusant. There is also a brief record of a tribute to his son.