Carrie,Your response was very timely.Just today I found Solomon Siever and Elizabeth in the 1850 census of Rockingham VA, page 60: Solomon Siever 47Va Elizabeth40VA John17VA Noah15Va Adrian13Va Mary11Va Clarissa9Va Jesse7Va Jacob5Va Amanda3Va Susanna1VA
Seems his brother Jacob is nearby.
By 1860 the whole Solomon Siever family is in Fulton Co IL.
Thanks a million for the clues you included. People like you really make researching easier.