While adolescents tend to under-use professional mental health services for depression, they informally seek health-related information from parents and peers. In this study, we interviewed 15 adolescents to examine how the views and behaviours of others influence teens' decisions about seeking care for depression. Using a grounded theory approach, we found that teens' families, peers, and siblings contributed uniquely to teens' decisions in seeking care for depression. Families may disclose a ''heritage'' of depression, and their choices about disclosing family mental health issues, previous treatment, and coping strategies affected teens' understanding of depression. Peer ''depression guides,'' who had themselves experienced depression, provided teens with advice on recognizing depression, managing stigma, and seeking care. Siblings bridged the roles of peer and family, influencing teens' choices about accessing treatment. These findings suggest that family and peers should be included during teens' depression treatment.