Seaman/Simmons Family(ies) of Rye

I am specifically looking for information on Silvanus (born around 1755 and died in 1818) and Jesse (born between 1756 and 1765). They may have been brothers and somehow related to Thaddeus and Richard. I believe they were descendants of Captain John Seaman, but I have been unable to determine the lineage. Any clues would be greatly appreciated.