Looking for descendants of the Revd Dafydd Williams (1779-1874), minister of Troedrhiwdalar Congregational church, Llanafan Fawr. Established new Congregationalist causes at Beulah and Olewydd, and lived at Tan-yr-allt, Glandulas. Wondering if any of his descendants are still in the area. Also any information on his biographer, the Revd D. Afan Griffiths (1830-1935) who also ministered at Troedrhiwdalar. And are the three Congregationalist chapels: Troedrhiwdalar, Beulah and Olewydd still open?