Effect of sibling perception of differential parental treatment in sibling dyads with one disabled child.

OBJECTIVE: To examine sibling perception of parental differential treatment in families of children with pervasive developmental disorder (PDD), Down syndrome (DS), and nondisabled controls.
METHOD: Sibling self-concept and social support were studied in the context of sibling perceptions of parental differential treatment and caretaker plus teacher evaluations of sibling behavioral adjustment. Measures were completed at time 1 and time 2. The effect of parental stress and the difficulty of the disabled child, as well as the sibling relationship, were considered.
RESULTS: For siblings of PDD children, internalizing and externalizing behavior problems identified by caretakers were evident at time 1 and more accentuated at time 2, at which time teachers also identified these difficulties. DS siblings were reported by caretakers and teachers to have only internalizing problems and only at time 2. These difficulties related to the perception for PDD siblings that they were preferred over their disabled sibling and for the DS sibling that their disabled sibling was preferred. Feelings of low competence predicted internalizing difficulties. Social support, especially over time, had a positive effect for all siblings, including the controls.
CONCLUSION: The elucidation of specific mechanisms contributing to adjustment problems in the siblings of disabled children will allow for the development of specific preventive interventions.