WAY BACK BEFORE MY TIME

I've suddenly come across some vague details about my great great grandparents who were called Thomas and Sarah Davies, who lived in Cilrhedyn. They actually lived on a farm called Crug Evan (or Crig Evan). I've done a Google search, with no luck as to the farm itself, and I'd really like to know where it is, and if it still exists. I know that their son Thomas took over the farm after his father's death in 1880 at the age of 85. One of their daughters, Phebe, was my great grandmother - died aged 41 in 1871 of TB. My grandfather, David Harries and sister we cast out of home after the death of their parents, and walked to Carmarthen (aged 12 and 9). David left his sister at a seamstress to be an apprentice, and made his own way to the workhouse. Later on, he and another boy opened an ironmonger shop (with a bucket and broom as their sole stock). David worked hard and became a wealthy man with farms, shops and was also the deacon of the Water Street chapel in Carmarthen for many years. Because of his early life, we don't have any details of his past, or the past of his ancestors....no photos, etc. We are wondering if you can shed any light on the whereabouts of Crug Evan Farm. We would love to know if it's mentioned on any maps, If so, could you let me know?