Hello
Vaynor Parish Records show Marion Jane Hopkins baptised 1st August 1920 Vaynor Church. Fathers Forename Anthony Pearson occupation/status Pattern Maker, mothers forename Ethel. Adress is listed Cantref, Cefn Coed.
Cantref was the name of the house.
Freebmd has a marriage record for Anthony P Hopkins and Ethel Gould June quarter of 1918 Merthyr Tydfil.
Cefn Coed or Cefn Coed y Cymmer is a large village in the parish of Vaynor.The village is situated on the edge of Merthyr Tydfil, Glamorgan but prior to the 1974 the parish of Vaynor including Cefn Coed was in the county of Breconshire. I hope this helps.