Strong evidence supports a genetic component in autism, and twin and family studies have also shown that genetic liability appears to be expressed among unaffected relatives of people with autism through features that are milder, but qualitatively similar, to the defining characteristics of autism. Therefore, studies of relatives of individuals with autism can help to simplify the complex autism phenotype and identify component traits which are more amenable to genetic dissection than the full clinical syndrome. In this study, investigators will employ a battery of measures to define language processing abilities among individuals with autism and their relatives. The primary goal of this work is to identify genetically meaningful autism language phenotypes. Results will provide quantitative measures that may then be used in genetic studies and which could be targeted in clinical intervention efforts. Research aimed at uncovering the pathogenesis of autism may lead to evidence-based approaches to prevention or treatment.