Hopefully you are still located at this email address. I am working on a book on the Rayfield family and have researched your branch in searching my unrelated family.
Your William Rayfield was born in KY about 1828 and was the son of Isaac and Elizabeth Stopp Rayfield, Jr. In the 1870 Posey Co., IN census, Elizabeth Rayfield, age 81 and born in KY, is in her son's household. This has to be Elizabeth Stopp. Isaac and Betsy were married in Cumberland CO., KY in 1816. Isaac does not show up in any census record but this has to be his son. Another son, James Rayfield, is located in White Co., IL.
I have this family back to 1703 when they first immigrated to NC. That puts the family back to the 1670s when William Rayfield, the immigrant, was born. I will be happy to share more.