Using latent profile analysis, the authors examined patterns of mother-father involvement in adolescents' peer relationships along three dimensions--support, guidance, and restrictions--in 240 Mexican-origin families. Three profiles were identified: (a) High Mother Involvement (mothers higher than fathers on all three dimensions), (b) High Support/Congruent (mothers and fathers reported the highest levels of peer support and similar levels of guidance and restrictions), and (c) Differentiated (more guidance and restrictions by fathers than by mothers, similar levels of parent support). These profiles were linked to mothers' and fathers' familism values, traditional patriarchal gender role attitudes, and socioeconomic status and to adolescents' friendship intimacy and risky behaviors measured longitudinally from early to late adolescence. Adolescent gender moderated the linkages between parents' involvement in adolescents' peer relationships and youth adjustment. (Contains 4 tables and 1 note.)