I did find Rachel b. 1785 on the 1850 census living with the McElrath family but I dont see her in 1870. Is she misspelled on the census in 1870?
Also Smith Abernathy is on same census page as Older and younger Alexander Abernathy in 1850. They are all living nextdoor to each other.Did Alexander leave a will or estate record ??? The Sherill's are on same census page too