I am not related to Rees Llewellyn , but I live in the third (and final house) that Rees and Ann lived in in Fountain Green. The first home (a one room log cabin) is in our back yard and is used as a shed. The second home is just across the street. If you would like pictures of the homes, I would be happy to email them to you. You may already know this, but Rees became a very prominent man. He was the first mayor of Fountain Green and was the postmaster in town. He was also a faithful Latter-day Saint. When our home was about half completed, Rees was called on a mission to return to Wales and preach the gospel. He was gone about 4 years, I believe. When he returned, the home was finished, but you can see that the brick on the second story varies from that on the first story. I consider it a physical reminder of his dedication to his faith.
I found your post while researching where in Wales the Llewellyns came from. Thanks so much for the info. Let me know if you would like pictures. I'd love to send them to you