The purpose of this study is to restore family functioning by conducting family art therapy for mother and sons family who have experienced trauma. Research participants are a mother and two sons (age 12 and 15) residing in A City. There were a total of 20 sessions once a week and a session took 90 to 120 minutes. Research instruments were analyzed by comparing the results of the pre-post-test of Parent-Adolescent Communication (PAC) Scale, Family System Diagnosis Scale (FSDS) and KFD (Kinetic Family Drawing). The family functional change process was analyzed based on a Transtheoretical Model (TTM), including works of art, transcripts of the session process, and counseling logs on nonverbal expressions. The results of this study are as follows: First, PAC test showed an increase in scores. The FSDS and KFD revealed a positive change in the family's emotional exchange and mutual communication. Second, as a result of analysis through the TTM, in the pre-recognition stage, the family refused the therapy with each family member shifting one’s responsibility to other family members. The death of the family member (husband/father) has been taboo but in the recognition stage, through processes of exposing the suicide of the family member and mourning about it, the family accepted the therapy. In the preparation stage, while trying new methods for change, he repeated successes and failures. Based on this, participants showed positive changes in intimacy and communication between family members in the action stage by practicing what they can do, and started to search for one’s dream. In conclusion, family art therapy showed positive effects on the restoring the family functioning of participants who with experienced trauma.