Regarding the influence on siblings, three siblings from this study are married and have given birth. However, mothers were sad when siblings expressed hesitation to marry and have children. Siblings hesitated to marry or give birth due to the fear of passing on the illness. The vague fears associated with misconceptions about and prejudice against persons with mental illness that the siblings experienced or acquired throughout their lives. It is necessary to establish appropriate facilities for families to consult with and provide opportunities to learn about genetic diseases and heredity so that they will not harbor prejudice.