Hi all, I have received the marriage certificate of William Joseph Young and Mary Ann Davies. It confirms what I have suspected. Mary Ann Davies was my grandmother's sister. Her daughter Violet Rose Young was adopted by James Rees Davies, Violet's grandfather's half-brother presumably after her mother died in 1904. I have a DNA link to the descendents of Violet Rose through her marriage to Jack Rosen: 1926, June 24, Paddington, London, Maurice Jack Rosen, age 25, son of Maurice Rosen to Violet Young Davis, age 25, daughter of James Reece Davis.
My thanks to all who contributed to this thread.
Ray