To Linda and Heywood - Thank you SO much for your interest. To answer your questions -
John Owen (b.1870) married Mary Elizabeth Jones (b.either 1872,3 or 4 in Festiniog) but I haven't been able to discover a marriage for them. If only, then I think my problem would be solved. I did get one cert. for Sept. 1890, but it was wrong (claimed by someone on another list.) Their children were Richard (1894), Anne Ellen (1896), William (1897), John David (1900) and Kate Mary (1904) - my grandmother. I have her birth certificate and even that has an error because Mary gave her maiden name as also being Owen. I even contacted the ONS registrar who, in turn, contacted the local register office in Pontypridd, who confirmed that Mary had given her maiden name as Owen. However, I do know that the family I have on the 1901 and 1911 censuses in Tonypandy are the right ones, as I was lucky enough to know 4 of the 5 'children.'
(Incidentally, Linda, I also wondered about the John Owen boarding at Church Street, Beaumaris, in 1881 and I guess it could still be him.)
I, too, have wondered about the David Owen shown as brother in law on the 1901. Don't know why he is shown as Owen, though, as I think this was Mary's brother, which would mean he was a Jones. We'll probably never know.
Heywood - can I ask you, please, where is the Parc Ga* you identified?
Again, very many thanks for your interest. I always think everything helps to build up a picture. This avenue (seeking Richard and Catherine) is because of my idea about using the naming pattern. I could be wrong, of course. If only I could find the marriage of John Owen and Mary Jones, it might answer questions - so long as they told the truth!
Dianne (born Tonyrefail, now in Somerset)