Background: Aggressiveness has long been linked to mental disorder. It has an impact not only on mentally ill person (MIP) but also on caregivers. In families with members who commit aggressive behavior, caregivers and people who are in close contact with MIP are more likely to experience an injury. Aggressivity experienced also causes an ambivalent response by the mother. Research Objectives: This study aims to explore the life experience of mothers who are caregiving mentally ill person with aggressive behavior. This study used a qualitative research design with an interpretative phenomenology approach to explore the mother's experience in facing aggressiveness by their adult children with agressivity. Participants were recruited by using purposive sampling and data were collected through in-depth interview. Research result: This study produced two themes, namely emotional bonding as the trigger for the ambivalent response and the conflict of mother's love and hatred towards MIP. Conclusions and Suggestions: The aggressiveness raises the ambivalence of feelings for the mothers. It is recommended to use this research as reference material to develop nursing interventions that focus on caregivers who care for MIP with aggressiveness especially towards their ambivalent response.