If no one is able to help you fit into a family genealogy at this stage, a first start would be to check the census records for Danville's county for 1940 and 1930. Your grandfather and grandmother might show up in those records. Look to see if other Sneads lived on the same block or close by. Look at the census pages, rather than just the limited information offered by a "look-up".
Input from cousins would also get you going.