Attachment Style With Mother, Father, Best Friend, and Romantic Partner During Adolescence Anna Beth Doyle, Heather Lawford, and Dorothy Markiewicz Concordia University Self-reported attachment styles with mother, father, best friend, and romantic partner were assessed longitudinally across adolescence. Three cohorts (ages 13, 16, and 19 years; N 5 373) from a community sample were followed across 2 years. There was only one change in attach- ment styles with age: the oldest adolescents were more dismissive than the younger. Adolescents were more secure with mother than with father, and most dismissive and fearful with father. Boys were more dismissing than girls, who were more fearful with a romantic partner (n 5 158). Across time, attachment insecurity with father was associated with insecurity with a best friend. Attachment insecurity with a romantic partner was associated primarily with insecurity with friend, but changes over time tended to be associated with insecurity with mother. Results support the view of a differentiated hierarchy of attachment figures in adolescence, with the quality of parental attachment contributing to close extra-familial relationships. Internal working models of attachment are widely recognized as influencing interpersonal expectations, motivations, and behaviors in close relationships across the life span (Bowlby, 1969, 1973; Bretherton & Munholland, 1999). Considerable research has clarified much about attachment to mother in childhood (e.g., Main, Kaplan, & Cassidy, 1985) and attachment to romantic partners in adulthood (e.g., Hazan & Shaver, 1987; Owens, Crowell, Pan, & Treboux, 1995; Simpson, 1990), yet much less is known about attachment quality during adolescence. In particular, we know little about attachment style with parents and other attachment figures across adolescence, when roles are being renegotiated and romantic relationships are becoming more central (Allen & Land, 1999). There has also been relatively little research on the stability of attachment security or on associations among attachment styles with different attachment figures across adolescence. The present short-term longitudinal study of self-reported attachment styles to parents, JOURNAL OF RESEARCH ON ADOLESCENCE, 19(4), 690–714 r 2009, Copyright the Author(s) Journal Compilation r 2009, Society for Research on Adolescence Requests for reprints should be sent to Anna Beth Doyle, Department of Psychology PY170- 15, Concordia University, 1455 de Maisonneuve Blvd. West, Montreal, QC, Canada H3G 1M8. E-mail: annabeth.doyle@concordia.ca