Have you noticed the posting by Melissa Seaver (MMSeaver) above? She is also from this Seaver line.
Have you had any luck connecting Joseph to any of the MA families? I've tried, but have had no luck with vital records, census, and probate records.
Would you mind sharing what info you have on this line with me? Please email me at firstname.lastname@example.org
and maybe we can sort this out together.
Regards -- Randy