Perceived competence and behavioral adjustment of siblings of children with autism.

Compared 19 siblings of severely autistic children with 20 siblings of children with Down syndrome and 20 siblings of developmentally normal children. Results reveal that siblings of autistic children have more internalizing and externalizing behavior problems than siblings of developmentally normal children; however, the three groups did not differ significantly on measures of perceived self-competence or parents' report of social competence. Examination of demographic variables indicate that age of sibling and parents' marital satisfaction were associated with siblings' psychological functioning. Implications for future research are discussed.