There was a much earlier James of Cape May, NJ, who was "a mariner who died at sea", but the accounts of the PUTNAM (not Putman) County Historical Society about James Jaycox/Jaycocks refer to ONE MAN, the husband of Deborah Purdy, who was ill, went to sea for that reason, and died. I find it very unusual that he would have been brought back for burial.I hadn't heard that, but it may be true if the ship was not that far away.
I have John Jaycox who married Esther Gee as brother of your James, but I DO NOT have Isaiah the Younger as his brother.
As I said in an earlier posting, I believe that your James was the son of "Isaiah the Elder".The wife of this man is not known. The eldest son, and heir, of James and Deborah Purdy was a son named ISAIAH.
"Isaiah the Younger", also seen sometimes as Josaiah, was born in 1751, in the same time frame as James who married Deborah Purdy, and John who married Esther Gee, but rather than their brother,I think was their FIRST COUSIN.
This younger Isaiah married Esther Mead.He was born in KENT, and lived in Cold Springs. His eldest son was named DAVID, and he had no known Isaiah.
Here we get into the Hempstead Jeacockes/Jaycocks.There is proof that David, the son of William, son of Francis the original emigrant, left Hempstead in the early 1700s, and went to Westchester County, NY. This David was the father of Francis Jaycocks of the Poughkeepsie Jaycocks, and of Joseph of the Putnam County Jaycox. Both appear in the family group of David on the 1698 Hempstead Census.
There was a DAVID JAYCOX, born before 1721, who resided in KENT, and lived on "Water Lot 2" and was described in a biography of one of his descendants. He was said to have "died comparatively young" and little is known about him.His wife is unknown. Presumably he was the son of Joseph, son of the above DAVID.
While I would not presume to correct the Putnam County Historical Society, I happen to believe that " Isaiah the Younger" was a son of JOSEPH,, son of DAVID, son of WILLIAM, son of FRANCIS the original emigrant.
Thus I think that" Isaiah the Elder" was the BROTHER of " Isaiah the Younger's" father.
When I dealt with the Putnam County Historical Society, their file of Jaycox waslarge, but they knew next to nothing on the early period after emigration from Hempstead for this family. Their filecontained some early references, but mainly contained information on later family members and related families.
That the Putnam County Jaycox families can be traced to JOSEPH the son of David is almost certain, but the inter-relationships of the earliest members of this part of the family are very difficult to sort out with absolute certainty.There is some good information available, but it is spotty.
I hope I have not offered you more information than you were after.