The purpose of this study is to raise the role of the family coach and the necessity of the case management by clarifying the meaning and the essence of the case management experience of the family coach who put the case management into practice to the grandparents-grandchildren family. The subject of this study is twelve family coach who take part of the case management of grandparents-grandchildren. They were the subject of the case management of Health Family Support Center in C city. In this study, I adopted Giorgi\'s phenomenological research method. I used the purposed sampling, a journal of case management, in-depth interview and the focus-group interview for data collection. As the results of this research, 6 components and 22 sub-components were elicited. 6 components were , , , , and . The social welfare\'s practical implications of this study are that the case management of the family coach is to improve the function of family, to supplement the role of case manager and to decrease the care-giving burden of the grandmothers. And, they also include that the case management of the family coach is to improve the desire of learning of the grandchildren, to help grandparents-grandchildren family to have the psychological and emotional stability and to suggest the training for the family coach of grandparents-grandchildren family.