“…Several authors found that siblings of a child with a disability are more susceptible to psychological maladjustment than siblings of normally developing children (Bagenholm & Gillberg, 1991;Dyson, 1989), whereas others claim that these children are no more at risk of problems than other children (Lardieri, Blacher, & Swanson, 2000;Stewart, Stein, Forrest, & Clark, 1992;Taylor, Fuggle, & Charman, 2001) and that some of them even gain advantages from their exceptional situation (Knott, Lewis, & Williams, 1995;Mates, 1990;Sloper & While, 1996). This discrepancy can partially be explained by methodological problems such as small test groups, the lack of appropriate control groups and the use of indirect measures (Eisenberg, Baker, & Blacher, 1998;Fisman et al, 1996;Rodrigue et al, 1993;Roeyers & Mycke, 1995;Stallard, Mastroyannopoulou, Lewis, & Lenton, 1997).…”