I don't think Patti was in Missouri, Charlie. She was on the 1800 & 1810 Lincoln County Census records but not on subsequent ones, however several of the children so far identified as David & Patti's are found in the St Genevieve/Perry/Cape Girardeau County area of Missouri shortly thereafter: sons James and Joshua were on Perry County Tax list in 1828 and both boys and their sister Sally and her husband were all on the 1830 & 1840 census Records for that county.
There are, to my knowledge, three distinctly different Turner Abernathys born between 1780 and 1800 who, as adults, are found in the area west of the Catawba River around 1810-1820. And which is which has been an interesting puzzle. One of them ended up in Washington County IL and t'others stayed in NC, where both can be found as of 1850, one in Lincoln County and one in Catawba County.
A Turner Abernathy was suerty for the marriage bond of James Rockett to Elizabeth Bandy on 2 Jun 1813 and either that Turner or a different one married Susannah Gooding in Dec 1813. A third Turner Abernathy married Fanny Whitener in 1821. All this was in Lincoln County NC.
Meanwhile, a Turner Abernathy was on the 1814 Tax list for St Genevieve County MO, was called for Jury Duty in Perry County MO from 1821 to 1822, and by 1830 had married and is found in Washington County, IL.
I have assigned one of those Turners to David & Patti Abernathy, one of 'em to Robert & Sarah Nichols and the 3rd is at present sans parents in my database.
And yes, a James Abernathy [likely the one who married Elizabeth Cox] was witness to 1) will of Valentine Dellinger of Mecklenburg County, NC on 08 Apr 1766 2) a Deed in Mecklenburg County of the transfer of land by Adam Sides to Geo. Sides, on 09 Apr 1768 3) the will of Robert Abernathy (3rd) on 31 Jan 1772 in Lincoln County, NC 4) the will of Robert Abernathy (4th), undated, in Lincoln County NC, along with John Rockett [probate 1792].
The 1795 will of David, son of James, was witnessed by John Rockett and Smith Abernathy. I believe Smith was a son of Robert (4th) and his wife Sarah, nee Abernathy. I also believe that the James Abernathy mentioned in that 20 Nov 1817 deed was David & Patti's son James, who by then had married Franky Abernathy, daughter of Jones Abernathy & Elizabeth Rutledge.
When you're working with a surname like this one, where lots of generations are crammed into a small area and lots of the younger individuals have the same given names as the older generations, careful examination of deeds, marriages, wills, and census records is imperative.
The Turner who married in Missouri or Illinois and the Turner who md Fronica Whitener both have living male descendants who opted for DNA tests (and both are proven of the Lineage group that includes many of the Charles City County Abernathy descendants), but of the remaining Turner, I have no names for any sons, only daughters (who ended up in Missouri). That Turner seemed to stay slightly below the official radar because while I think I found him on the 1830 census, I could not distinguish him on the 1840 census.