according to 1790 census of Pa. Isaac had only one son , no name given . contact Randolph Co. NC Public Library Asheboro NC. They can copy excerpts from Farlow family book. Isaac's parents are covered in sec.3b.I'm not sure what info they can give. Isaac's uncle Michael is my 5th great grandfather. Randolph Co. Library supplied me with quite abit of info. sorry i can't be more help.