I'm putting Jane to one side at the moment.
Regarding the question of which John was the son of John & Ann, we know from the baptism register, that John, twin of Esau baptised 25 March 1743 definately was.
Ormand was buried at Newton on 6 August 1764 (Gregorian). On 8 April 1772 the baptism register at Newton has: "William Harding, son of John, bachelor, and Sarah Harding, his late brother's widow* Married". Looking at how the entry is laid out (possibly in the margin) I suspect "Married" was added later- we cannot say for certain without seeing an image of the original register entry. I believe that William's mother was Sarah Harding nee Sparkes. There are subsequently 3 female baptisms for this John and Sarah at Newton between 1775 and March 1781.
Now for the John Harding aged 62, who was killed by a falling rock at the Newton stone quarry, buried at Newton on 17 July 1796, making his birth circa 1734, but this did not appear in the baptism register at Newton. However, I also found the baptism of 2 daughters of John & Sarah at Newton: Mary Harding in 1767 and Dianna Harding in 1769, both after Ormond had died.
The Removal Order dated 13 December 1738 included parents John & Ann, with children Ormand, Moses & John. Of the 2 Johns, both sons of John & Ann, only this elder John was alive.
So John 1734 - 1796 married Ormand's widow Sarah nee Sparkes, but in view of the note "Married" mentioned above, this may not have been before the birth of Mary and Dianna, but they are not noted as being "base born". The subsequent children: William in 1772, Martha in 1775, Lydia in 1778 and Lydia in 1781, initially thought to have been fathered by John, Twin of Esau as above, would all appear to have been legitimate from birth.
We now have nothing on the twins beyond their baptism and the same goes for their younger sister Sarah baptised 1747 as we don't know where their parents John and Ann were after 1747.
You can imagine how many scratchings-out there have been getting to this conclusion. I have had to correct my tree last worked on in 2011, but all to the good.