This class shows how to enhance the online genealogy experience, going beyond database searches and record hints to help even beginners find entire families and extend family trees. We demonstrate the degree of family reconstruction achievable in various cultures via automatic record linkage of parish register indexes. We review necessary conditions for family reconstruction such as a non-migratory population base and the breadth and depth of record coverage. We examine which genealogical details must be indexed to guarantee proper family reconstruction. We discuss challenges arising from errors and inconsistencies in personal names and place names, outlining inexpensive practices to reduce these problems. We show how to apply probabilistic record-linkage to reconstruct families in Mexico, French Canada, Norway, and Poland. We recommend guidelines for generating hints from reconstructed families to existing family trees.