In response to your 'First Problem':
While on a research trip to Wilkes County, NC this past April, I located the recorded 'William Nance Will' which he signed, sealed and acknowledged on 11 February 1826 by his mark (he died in 1828). In this document he clearly names his wife as Sarah and his children as William, Miles, John, Ester and Susannah. It appears that your Lewis Nance was NOT a son of this William Nance.
I've seen where a lot of people have attached themselves to this William Nance without documented proof thus creating a great deal of confusion. I'm only hoping that by citing this actual document, it will eliminate much of the mis-information that is out there.
3Xgreat-granddaughter of Miles Alonzo Nance son of William Nance.