Perceived parental knowledge and adolescents' disclosure to parents were predicted from parental warmth and monitoring and adolescents' disclosure, agreement, and beliefs about obligation to obey and parental legitimacy (N =698 Chilean, Filipino, and U.S. 13–20‐year‐olds). The correlates of knowledge are similar in all three countries, but the relative strength of the correlations differs. Global agreement was associated with greater knowledge. Parents knew most about issues governed by rules and those where adolescents agreed, felt obliged to obey, and disclosed. Monitoring predicted knowledge only in Chile and the Philippines. Warmth was a stronger predictor of knowledge in the United States. Key predictors of disclosure include agreement in Chile, agreement and rules in the Philippines, and warmth and rules in the United States.