Siblings of people with disabilities have more exposure to people with disabilities than most nondisabled people, uniquely positioning them toward disability, yet less is known about how this might impact their attitudes. This study examined siblings' disability attitudes by determining siblings' explicit and implicit disability bias, mapping their 2-dimensional prejudice, and examining theoretical variables that might be relevant to their attitudes. To do so, the Disability Attitudes Implicit Association Test, the Symbolic Ableism Scale, and survey questions were administered to 48 siblings. Findings revealed the majority of the siblings implicitly preferred nondisabled people, despite reporting low levels of explicit attitudes.