Apologies...Friday evening so now I can catch up. I find that I now have two projects; one backwards and the other forwards!
Backwards. Roger, you are spot on with the problem. I'm coming to the conclusion that ages and DOBs are highly suspect. The age relies on the accuracy of the newspaper report. We had to 'interpret' the real name. I still believe that your discovery of the sister's address holds the answer.
Robert Williams m. Mary Ann Jones. Birth records of offspring confirm mmn. Jones.
There was a Mary Ann Jones born Q4 1902 Carnarvon district (that would include LLanllyfni) 11b, 849.
Robert Williams m Mary A Jones Q2, 1927 Carnarvon district 11b, 849.
The Williams tree shows Mary Ann Jones born 20/2/1903, 6 Tram Road, Penygroes.
I've been in contact with the Williams tree owner who has given me a contact for more info...I'll email over the weekend.
The 1911 census at 7 Old Tram Road shows Richard Jones, b 1880, LLanllyfni. Daughter Mary, aged 8, b. 1903. Wife Mary, aged 29, b 1882 LLanwnda.
The problem is that the interesting birth records don't give a mmn!
Forward...thanks Rosie and support!
I have that item on file. It didn't fit.
I'll keep trying!