Given the increasing numbers of Latino children and, specifically, of dual-language learning Latino children, entering the U.S. educational system, culturally contextualized models are needed to understand how parents construct their involvement roles and support their children's educational experiences. Current measures of parenting and family engagement have been developed primarily with European American families and, thus, might not capture engagement behaviors unique to other ethnic groups. Lacking culture-appropriate measurement limits our ability to construct programs that adequately incorporate protective factors to promote children's successful development. The present mixed-methods investigation employed an emic approach to understand family engagement conceptualizations for a pan-Latino population. One hundred thirteen parents from 14 Head Start programs in a large, northeastern city participated in the first study, in which domains of family engagement were identified and specific items were co-constructed to capture family engagement behaviors. Then, 650 caregivers participated in a second study examining the construct validity of the resulting 65-item measure across two language versions: Parental Engagement of Families from Latino Backgrounds (PEFL-English) and Participacion Educativa de Familias Latinas (PEFL-Spanish). Four theoretically meaningful dimensions of family engagement among Latino Head Start families were identified empirically. The measure was then validated with teacher report of family involvement and parent report of satisfaction with their experiences in Head Start. (author abstract)