The relation between cultural socialization and ethnic pride during the transition to middle school was examined for 674 fifth‐grade students (50% boys; Mage = 10.4 years) of Mexican origin. The theoretical model guiding the study proposes that parent–child relationship quality is a resource in the transmission of cultural values from parent to child and that parental warmth promotes the child's positive response to cultural socialization. Results showed that mother and father cultural socialization predicted youth ethnic pride and that this relation was stronger when parents were high in warmth. The findings highlight the positive role parent cultural socialization may play in the development of adolescent ethnic pride. Furthermore, findings reveal the role of parent–child relationship quality in this process.