I extracted the text; they're all Alcorns-- sons and daughters. See text on Isham's profile where I've transcribed what's in the affidavit.
Frank found Mary Lucinda's marriage to Samuel Rice, and she is definitely named Alcorn. AND she names her first daughter Permilia. Perhaps she was raised by Isham and Parmelia, but that she's excluded from the list of children in the affidavit AND born prior to Isham and Parmelia's own wedding suggests she was not, at least, Parmelia's daughter and it doesn't look like she was Isham's either.