- At least one primary parent or caregiver must participate in the assessment and treatment. This could be a biological parent, stepparent, grandparent, other relative, or a foster parent, who has at least frequent contact with the subject. When possible both parents will participate in the assessment and treatment. Legal custody is always considered (e.g., divorced parents). Having all family members present at every session is not required. Many individual meetings with the subject or the parent are planned in both treatments.