Just for reference - this could be the John Morgan Jones b 1855 that relates to the bapt heywood found - In 1871 living at Long Row, Treforest
David Jones 39 b Craig Trebanos, Glamorganshire Iron Plate Roller
Margaret Jones 36 b Gwynfe, Carmarthenshire
John Jones 16 b Craig Trebanos, Glamorganshire Weigher of Bar Iron
Elizabeth Jones 14 b Craig Trebanos, Glamorganshire
David Jones 12 b Craig Trebanos, Glamorganshire
Harbert Jones 3 b Treforest, Glamorganshire
Mary H Jones 1 b Treforest, Glamorganshire