Hello PaulineJ, Ellenmai, rosie99, wrjones, and Wilcoxon.
Apologies for the delay to responding to all your really helpful replies. I only get to see Bob, who asked for help with this tree once a week - on a Thursday afternoon, so weren't able to review everything straight away. But all your help is certainly appreciated.
Wilcoxon - thanks for the link. I'm onto it and hoping to make contact with the tree owner directly. I did notice that they also can follow the female line - as have we - but not the male line which is our aim.
wrjones - agreed, something is certainly amiss. Some of the family lore is in correct in someway. Oddly - the Denis John Williams who was born in Conway is known to us, and is not the right one.
PaulineJ - We cannot locate the correct birth certificate, and there seem to be few other records. We have his army record which states his mother was Irish.
Ellenmai - The Three Towns Forum also drew a blank, even though Denis John Williams was quite well known in Llandudno. But seems to have said little about his background or origins.
Apologies also for any duplication - that was due to my over keenness.
Bob is hoping to get listed on Rootschat when he has a moment so will be able to respond more quickly than I.
Thanks again.
Dewi (and Bob)