With this letter the first thing of note is Julia bringing up the Cole family. She agrees that Nancy Cole is likely descended from John Cole. Julia says he's likely her and MInnie's ancestor as well due to the fact both Nicholas Guyther and John Cole arrived in America around the same time. Minnie had brought up that Cole was a long running family in their great-grandmother's family.
There is a later mentioning by Julia about how George Guyther was a member of the "Committee of Safety and Correspondence".