The major purpose of this research was to investigate the relationship between pets owner and pets in the context of family and leisure. Especially, this study focused on those family situated in childless life cycles, including pre-marital phase, newlywed phase, parenting phase, empty-nested phase, and retirement phase. The qualitative in-depth interview, assisted with participant observation, has been employed as the key method for data collection. In this study, totally 8 interviewers, including 7 females and 1 male, were successfully acquired from January to April 2007. After analyzing the data by category and situation analysis, the role of pets within family context could be revealed in the following conclusion:(1)pet as mediator, which was able to conciliate and alienate pet-owner’s interpersonal relationship (2) pets as representative, which affected and re-define the meaning of leisure between couples(pets-owners), (3) Pets were able to reflected the process of self-awareness of pets-owner (4) The role of pets in family was altering according to different family life cycles. Although pets played children’s role in every family phases, but it had weak relation in parenting phases.