20 ILCS 540/10
As used in this Act:
"Family income" means the sum of a family's annual earnings and cash benefits from all sources before taxes, less payments made for child support.
"Serious mental illness" means a diagnosis set forth in the most current version of the Diagnostic and Statistical Manual of Mental Disorders (DSM).
"Serious emotional disturbance" means a diagnosable mental, behavioral, or emotional disorder in a child or youth that resulted in functional impairment which substantially interferes with or limits his or her role or functioning in family, school, or community activities.
"Child or youth at risk of custody relinquishment" means a child or youth whose parents or guardians refuse to take the child or youth home from a hospital or similar treatment facility because the parents or guardians have a reasonable belief that the child or youth will harm himself or herself or other family members upon the child or youth's return home, and there is no evidence of abuse or neglect.
20 ILCS 540/10