Hi,
Forgot to add if you have a date of death, for the Paul family, the FH library are able to look up interment records for the nearest large cemetery to Pentre, which would be Treorchy, if they died within area. Can also tell you who is in same plot number and address at death, who owns plot etc. They can scan and email original. This can help confirm electrol info, if any.
I have checked the index of the other largest cem in area, but not there (Trealaw) only looked for surname Paul, and names mentioned.
FH Libraries are located at Aberdare and also Pontypridd. Treorchy Library used to be a fantastic resource with great staff, but due to local cuts was closed a while ago. Resources were moved to the other FH libraries, out of immediate local area.
Good luck if you contact.
ADDED looks possibly likely David J Paul died in Pentre area 1950 Pontypridd reg district.
Cas