Saw you Betterton Family on Ancestry.com, I have to say I almost feel out of my chair....
I am a family researcher of the family of Robert White Sr 1743-1843, who was married to Mildred (Milly) Whitehead White, have reserached all 10 surviving childrens families.
Until I saw your posting, our family has always believed that Stephen White married Nancy Beddington, of Spartanburg Co SC, this came from a grandsons letter written in 1886.
We have found only 2 documents in all of Spartanburg and Union with Beddington, a Thomas and a James Beddington, involved in a deed transactions, in the 1787 amd 1794, we have wondered why there was nothing else, that is until I saw your BETTERTON, and now realize that our Isaac P Murphy, grandson of Robert White Sr made a serious mis-spelling.
Anyway, I reveiwed your information, and I know where Stephen and Nancy moved to after Union Co SC, can also help on some of the Dates you have and death places, etc
I would 'dye' for the source information you have on Stephen & Nancy Betterton White, I have looked for years without success, and there children.
In the 1886 letter Mr Murphy writes that Stephen married Nancy about 1810/11 and moved to Texas... which ultimately was correct, but I believe they may have lived in GA and AL prior to arriving in TX in 1836/37.
One of my mysteries is why 6 PRITCHARD children were living with Stephen and Nancy in 1850, your posting solves this mystery, Sion and Mildred must have died before 1850.
Please contact me, Mike White firstname.lastname@example.org