“…However, researchers interested in adults have not approached the study of siblings and friends in a similar manner. There are large literatures on older adult friendships (Adams & Blieszner, 1989, 1994Blieszner & Adams, 1992;Sherman, de Vries, & Lansford, 2000) and sibling relationships (Bedford, 1989(Bedford, , 1996Bedford, Volling, & Avioli, 2000;Cicirelli, 1985Cicirelli, , 1989Gold, 1989Gold, , 1990Gold, Woodbury, & George, 1990). Although Connidis (1989) examined characteristics of sibling relationships that are related to defining the sibling as ''a friend,'' investigations of sibling relationships and friendships have generally remained separate areas of inquiry.…”