Purpose: This research was conducted in order to identify interpersonal conflicts of the married people obliged to take care of their old parents. Methods: This study was conducted by adopting a qualitative method and phenomenological approach. Participants in this study were married people with children who were taking care of their elderly parents, and were living in city of Qom, Iran, in the year 2016. The statistical sample included 13 individuals (8 females and 5 males) selected through purposeful sampling method. The number of participants was based on the principle of saturation. Data collection was done through semi-structured interviews and analysis of collected data was done based on Collaizi's seven-step method. The method includes a range of steps from reading interview transcriptions to validation of findings. Findings: The interpersonal conflicts that participants experienced were categorized into four classes namely siblings' conflicts (disagreement and maladjustment), marital conflicts (marital deprivations, maladjustment, promotion of bad moods and tripartite conflicts), parent-child conflict (low attention to children, maladjustment, problems of young children, tripartite conflict), and child-parent conflicts (enmeshment, maladjustment). Conclusion: Based on the findings of the present research, it may be suggested that adult children's caring for elder parent/s may contribute to certain interpersonal conflicts for the married adult children. However, comparison of current findings with conclusions of previous surveys suggest that this issue is not an absolute factor, as other factors such as socioeconomic-status, familial conditions, parent’ s previous attention to his/her child, and children’ s norms and motivational beliefs are also influential.