Thanks for the message - unfortunately not sure that I will be able to assist. The one thing I have learned about the Rees family of Llangyfelach is that there are a lot of Rees' in the Glamorgan area!! Have checked the info. I have gleaned so far and cant make a connection with Elizabeth Ann Rees or John Elias on our side of the family.
However, if you think it would help - I am happy to let you view the family tree I have constructed so far - for you to check any other connections. Let me know and I'll set this up.
Good luck in tracking down your ancestors....