A follow-up study was conducted on parents whose children participated previously in group psychotherapy for children with developmental difficulties, "Moku-moku group". 18 mothers were interviewed using semi-structured questions, and assessed levels of adaptation by others evaluation scales. As results, mothers considered group psychotherapy more effective than individual psychotherapy to resolve interpersonal problem of children. We found the process of psychotherapy that receptive attitude of therapists and group members influence the changes in problems of children, and group maladaptation was subsequently resolved. Mothers considered that programs designed by children themselves were quite significant. From the interviews about parents' group, many mothersevaluated meaningful, nevertheless a few mothers had negative thoughts. It suggests necessity to examine ways of support in parents' group programs.