This document contains a brief bibliography of peer-reviewed literature, with abstracts, on sibling relationships in adulthood. It is one of 12 bibliographies on aging prepared by the National Agricultural Library for its "Pathfinders" series of publications. Topics covered by the other 11 bibliographies include aging parents, adult children, dementia and Alzheimer's disease in the elderly (written for educators), dementia and Alzheimer's disease in the elderly (written for consumers), family caregiving, family support networks, grandparenting, humor in later life, intergenerational relationships, living arrangements in later life, and pets and the elderly. This bibliography on sibling relationship in adulthood contains citations for 8 journal articles, 4 reference books, and 4 chapters in books for researchers and educators, and 4 books and articles for consumers. It concludes with a list of organizations that readers may contact for further assistance. (NB)