Jonah Jones and Edith Maud Roberts

[wwall]

Hi I'm searching for Jonah Jones b. 1874 and Edith Maud Roberts b.1883, my great grandparents. I have a marriage certificate that says that they were married in the Registry Office in Pontypridd. Both of them were living in Porth at the time of their marrige 28.07.1902. His father was David Jones, collier and hers Richard Roberts, coachman. David Jones was not at the wedding. They had 5 children Clifford, Victor, Hilda, Unwyn b1910 (my grandfather) and Brynley. There was also another child Mabel, who I believe was from Jonah's first marriage. I have found several Jonahs and hundreds of Davids in various census and BMD, but I am at a loss as to how I can find the right one. There is no family that I can ask, but I believe that Brynley was doing some family history research. If anyone has any ideas to help me I would be really grateful.
regards wendy