mental illness: refers to a wide range of mental health conditions — disorders that affect your mood, thinking and behavior. Examples of mental illness include depression, anxiety disorders, schizophrenia, eating disorders and addictive behavior
effects on families: The onset of a sibling's mental illness can cause other siblings confusion, stress, anger, sadness or fear for their brother's or sister's well-being. ... Embarrassment about being with their brother or sister. Jealousy of their parent's attention. Resentment about not being like other families.
hope this helps :D