Little research has examined the association of parents' friendships with adolescent's well‐being, perhaps because the association was considered too distal. However, developmental theories suggest that contexts in which parents, but not their children, are situated may be related to child development (Bronfenbrenner, , ). The current work examined associations between the quality of mothers' own friendships and their adolescent children's friendship quality and emotional adjustment. Fifth‐, eighth‐, and eleventh‐graders (N = 172) whose mothers' friendships were characterized by conflict and antagonism reported having friendships that were high in negative friendship qualities as well as elevated internalizing symptoms. These associations held after controlling for mother–child relationship quality, suggesting that mothers' friendships may have a unique association with adolescents' adjustment.