Associations between grandmother and partner involvement and adjustment were examined among 61 Puerto Rican adolescent mothers. Results indicated that associations between grandmother involvement and adjustment were moderated by the adolescents' level of acculturation. Greater support was related to less symptomatology and parenting stress when acculturation scores were low but to more symptomatology and parenting stress when acculturation scores were high. Social support from partners was related to less symptomatology (but not parenting stress). Although coresidence with a partner was related to greater symptomatology, a significant interaction effect revealed that coresidence was associated with greater symptomatology mainly when mothers perceived their partners as providing low levels of support. Results are discussed in light of Latino cultural values and normative developmental issues. Implications for intervention strategies are also discussed.Social support has been proposed as an important positive influence on psychological adjustment and parenting competence, especially for those parenting under conditions of high stress or social risk, such as young minority mothers (Wilcox, 1981). For adolescent mothers, research has identified both their mothers ("grandmothers") and their partners as important potential sources of support (de Anda, 1984;Flaherty, Facteau, & Garver, 1991). However, research examining the role of partner and

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