I can't give you any specific sources. It was the lack of sources that prompted me to attempt to summarize the notes I had. A feeble attempt, but one I hope will give others a basis upon which to begin. The numbering system is fairly simple, the first child of the eldest generation is 1, the second, 2, etc. The tenth is J, the eleventh is K (the tenth and eleventh letters of the alphabet. Thus the 3rd child of the eleventh child of the 5th child would be 5J3. 524 would be that person's first cousin, 52 is and aunt or uncle, 5 is the grandparent, etc. A suprising number of Jaycocks appear to have been Loyalists, or perhaps not so surprising. The American Revolution is painted as a heroic struggle against tyranny. It was a civil war, and the Loyalists were often families long settled in America, while the Patriots were often fairly newcomers, who saw an opportunity to profit by theft of land and property. This is not a sour grapes point of view, but well borne out by historical evidence. American 'history' often lacks that apparently unnecessary element of proof. What the people of the United States apparently fail to recognize is that many Canadians are descended from old colonial families; many of whom were here long before their own ancestors arrived. (In short, they are more American than many Americans.) This bit of bombast is to explain that being hung as a traitor has different interpretations. The spelling of the name varies so wildly, even in the earliest records. I use Jaycocks as it 'pronounces' more accurately, and probably reflects the origin of the name. (I have seen, "Jaques the Cook" offered, but can't take it seriously.) You might wish to direct queries to Sharilyn Whitaker, who should have some messages on this board, as she has assiduously been attempting to build something of the family of Francis of Poughkeepsie. Also, I have posted some gleanings based on the IGI on Jaycocks from Warwickshire ca. 1580-1650, in an attempt to define the early family. This was, at best, only succesful in showing that the family was established in that county for at least several generations. I would think that your theory is well-based, judging in terms of chronology; a key may be where the Leroy's were from. If they were from Poughkeepsie, or nearby, then Francis of that place is probably her ancestor in some capacity. Grandfather seems about right. You might want to visit:
The objective is to discuss something of the ancestors and history behind the Flewelling family, but the Jaycocks play a significant role, and there is some speculation about them. There is also a faulty attempt to outline the early generations in America. Francis of Poughkeepsie is believed, by myself and Sharilyn, to be the son of David of Hempstead, son of William son of Francis and Grace of Stratford-upon-Avon, Warwickshire, ENG and Stratford, CT. I don't know that the Jaycocks were black sheep. Judging by the original Francis, they may have been contentious and anti-authoritarian; but I suspect trouble came their way without their having to look too hard. The early colonists were all a quarrelsome lot. I read one incident where the question as to whether a lady's petticoats had been made in England or not ended in court. All in all, I have found their descendants to be honest, intelligent people of good character (if not always wise and prudent) with whom I am pleased to be connected.