My sister has become progressively mentally ill during the last 2 years. She has a thyroid problem and has not taken her medication for about 2-3 years. This all began with a period of severe depression after a break up. She seems to be bipolar - but I believe her behavior is more schizophrenic...she believes that people are using her identity - has attempted reporting this to the police and has also called Social Security. She continuously says that they're out to get her. She currently lives with my "Senior" parents. She does not leave the house. She says that "they" will kill her. My question is....Is there anything that can be done to "force" someone to get help/treatment? All my siblings have tried talking and reasoning with her, but she's now managed to frustrate everyone....constant arguments. She insists that we're the stupid ones. "They're" going to get us. Are there any options besides her initiating the treatment? My parents don't deserve this at this point in their lives.