Clair; Edward's daughter? I've been in touch with some of the Mendels and Johnsons. Sarah and Deliah were the two of Agnes' 12 siblings with whom she seems most close. The other 10 just didn't seem to be in her circle. Most of the Joy ancestry is known back to the original Great Migration immigrants and some well back into the 15th & 16th centuries. However, AFAICT, Jullia Williard is a complete mystery.
I have most of the Joy line on a tree here on Ancestry.