Our purpose for conducting this investigation was to extend the research on the help that siblings of children with mental retardation give to their brothers and sisters to include not only custodial care, but also other forms of helping behavior, such as emotional support, tangible aid, and information giving. We compared 100 siblings (50 with and 50 without a brother or sister with mental retardation) in terms of their perceived helping behavior. Siblings of brothers and sisters with mental retardation engaged in higher levels of perceived emotional support and custodial care but not information giving or tangible aid. Perceived custodial care and emotional support were associated with gender, the child's need for assistance, and self-esteem.