Research Question/Issue: This study attempts to uncover a hidden benefit of shareholders' excess control rights in family firms by examining whether excess control rights can reduce the likelihood of financial misconduct in family firms, compared with nonfamily firms.Research Findings/Insights: We argue that excess control rights are especially useful for family-owned firms, compared with firms with other types of ownership, in preventing financial misconduct. They afford family owners the ability to guard against misconduct that can damage the founder's legacy and reduce the family's socioemotional wealth. We also investigate two boundary conditions, the presence of a family member as the board chair and the family's public visibility, that validate our proposed theoretical mechanism. In these scenarios, the family owner's socioemotional wealth is particularly high and could be impacted severely by misconduct.Results from a sample of 2516 publicly traded firms in China support our theory.Theoretical/Academic Implications: Our study challenges traditional agency theory about excess control rights by exploring the potential of excess control rights to mitigate principal-agent problems and prevent financial misconduct in family firms.