Abstract: The authors developed a smartphone application called “Children’s Own Museum,” intended to compose a part of a family portfolio. The application includes a function to store pictures of objects designed by children, under the principle that it is important to record objects made by children as well as their pictures. A function to view works according to a timeline and a function to confirm the process of creating works were also implemented. Parents can record not only their children’s works but also their own works, and by doing so can promote communication among family members. These functions will help users grow and develop as a family and will improve “parental awareness” and “interpersonal interaction themes.”