If your ancester, Joseph, immigrated in 1792 then he is not a descendant of Robert Seaver/Elizabeth Ballard. However, there are several Josephs in the line and it is possible your's is one of them. If you can find his father's name I may ber able to tie it into the Line. Unfortunately, I have only part A of Jesse's work and it deals soley with the descendats of Robert's first son, Shubael. There are three other sons, Caleb, Joshua and Nathaniel and they are covered in other parts of the Genealogy.