Although a number of measures have been developed to assess parent–child attachments, validity data on middle-childhood measures are lacking. The present study tested attachment-based measures of parent-child relationships designed for the later middle-childhood years (9–12 years of age). Self-reports from children assessed perceptions of security and avoidant and preoccupied coping. Some children also completed a projective interview assessing attachment state of mind. Mothers and fathers reported their willingness to serve as an attachment figure and were rated for responsiveness. Data were collected from a cross-sectional sample of 3rd and 6th graders and their parents. A 2-year follow-up on the younger sample provided data on the stability of the measures. There were modest associations across the different measures and moderate to high stability. The attachment-based measures were also related to teacher ratings of children's school adaptation.