To examine the influence of older siblings on the sex-typed toy play of younger siblings, a study was undertaken of 60 children, 2 to 5 years old, with equal numbers of boys and girls with older brothers, older sisters, and no older siblings. Children's toy collections were inventoried and classified into conventionally male toys, or toys of the world, such as transportation vehicles, sports equipment, and action figures, and conventionally female toys, or toys of the home, such as dolls and housekeeping toys. Parents were surveyed to determine children's favorite toys and the extent that toys were shared among siblings. Results of the study included the following: (1) toy collections were found to be strongly related to gender, with boys playing with more toys of the world and girls with more toys of the home; (2) girls with older sisters had more girl-typed toys than other girls, and boys with older brothers had more boy-typed toys than other boys; (3) boys with older sisters had more girl-typed toys than other boys but, surprisingly, girls without older brothers had more boy-typed toys than other girls; (4) while all of the same-sex siblings shared toys, only 54% of opposite-sex siblings reported sharing; and (5) with respect to opposite-sex siblings, 86% of the younger brother-older sister pairs shared most of their toys, while 17% of the younger sister-older brother pairs did so. (BCY)