Hi Anne

Given that Emma was born at Brockweir Common, and that she was living there at the time of the burial of her daughter Sarah Jane, it would seem reasonable that her parents were William and Mary Anne. If they weren't, someone will soon tell us! So far I haven't been able to find a marriage for Emma, but there is a possible burial in 1913 at Bream aged 77. Regarding the children:

On FreeBMD

Birth Registered for Dorah Elizabeth at Chepstow Jan-Mar 1867 Vol 11a Page 14
Possible marriage at Pontypool Jan-Mar 1887 Vol 11a Page 148

Regards
Chris