Research into the organization of the firm typically contrasts family businesses with impersonal corporate structures, and kinship ties among corporate elites are often associated with inefficiency and corruption. This analysis of over 14,000 equity investors and executive officers finds that familial networks were embedded in early corporations, not just among directors but also among small shareholders in the firm. Related investing was especially prominent among women and other relatively disadvantaged groups. Personal ties in newer, riskier enterprises encouraged capital mobilization in emerging ventures and persistence in shareholding, and related investing was significantly associated with lower risk of corporate bank failures. The results support a more positive view of family networks in business organizations and in overall economic development.