Adam is one of 12 children of Heinrich Peter Struble and Elizabeth Longcor. The information on this family is available on various Internet family trees. Elizabeth's parents were Johann William Langhar (circa 1716-after 1761) and Anna Elizabetha Mies, both born in Germany (town not yet known to me).
Elizabeth's brother Abraham Longcor is ancestor to my wife and children. Information about the Longcor family branches is included in my Howard-Gibbon Family website, and also in my GEDCOM in the RootsWeb WorldConnect project.