The Sibling Interaction and Behavior Study (SIBS) is a prospective longitudinal study of sibling pairs, including both adopted and non-adopted adolescents, and their parents (McGue, et al., 2007). Sibling participants and their parents attended an intake (IN) assessment when the siblings were in mid-adolescence, and the siblings were re-assessed at approximately 3.5 year intervals, in late adolescence (FU1), and again in early adulthood (FU2). Participants visited the research facility for IN and FU1 assessments, but the FU2 assessment was conducted over the phone.
