AUSTIN 'JOSEPH, b. +-1616 ... all had to do with Dover. ... The relations of these men to each other, to the Austins of Charlestown, and Annis (Austin) Littlefield, have not been exam. ... By Oct. 1649 he had m. Sarah Starbuck of Dover, dau. of Edward and Catharine (Reynolds) Starbuck. ... Will 25-29 Jan. 1662-3.'
Note that the authors list Francis Austin (husband of Isabel Bland) prior to Joseph, but make no link between Francis and Joseph. There appears to be no evidence that identifies the relationship, if any, between Joseph and Francis Austin.