Investigated the relation between adolescent girls' relationships with their mothers and their relationships with their closest girlfriends by administering a questionnaire to 134 high school girls in Dearborn, Michigan. Ss' reports of mother–daughter affection, democratic treatment by their mothers, and appropriateness of their mothers as models were related to the intimacy of their relationships with their closest girlfriends, the mutual influence in these peer relationships, and their identification with the girlfriends. The validity of each of these measures was tested by correlations with other purported measures of the same variables. Ss' judgments of their mothers' appropriateness as models and affection in the mother–daughter relationship were reliably and positively correlated with intimacy and identification with the girlfriends. Ss who identified with a democratic mother reported more mutual influence in their friendships. The data are discussed in relation to compensatory and developmental theories of the effect of parental relationships on adolescent peer relationships. The data support a developmental theory that posits that intimate peer relationships are nurtured by certain positive relationships with parents. (18 ref) (PsycINFO Database Record (c) 2016 APA, all rights reserved)