This study deals with missional practice of local church for the grandfather and grandson family. This article focuses on carrying the missional alternatives to the grandfather and grandson home in the Korea context. The grandfather and grandson home has so many difficulties about health, economic, social, and spiritual relationship. Because their problems brought out home collapse, divorce, and aging society. This article explains some opinions the task of social institutions, governments, and local churches. They should be need counseling, care, financial support, study support, and programs from local churches and social welfare institutions. I want to suggests several kinds about missional practice for the grandfather and grandson family. First, local church and pastor should be change paradigms about social service mission. The church mission could be act for the grandfather and grandson family. Second, the missional practices are making network among social welfare group, local church, Christianity NGO, and government. Third, local churches support program development and service improvement for them.