Recently there has been concern over the need for developmental research within ethnic minority populations and interest in socialization and family variables within, and variability across, ethnic groups. This study reports analyses designed to: compare several socialization, family, and mental health variables among Hispanic and Anglo American 8-14-year-old children and mothers; examine the regression equations predicting mental health indicators with the socialization and family variables; and evaluate the cross-ethnic scalar equivalence of these socialization and family measures. The findings indicate that there are ethnic differences in several socialization and family variables; several of the socialization and family variables are related to the mental health variables, and these relations are very similar across ethnic groups; and the socialization and family measures appear to have sufficient cross-ethnic scalar equivalence for English-speaking, largely Mexican American Hispanic samples. Further, these findings suggest some caution regarding the use of the Child Depression Inventory in Hispanic samples.