I'm 26 male . So here's the issue . My sister continuously harasses my mother and father if her unreasonable demands are not met or if she's asked to return home at curfew(10pm set by my parents) and things of similar nature . My sister is in her early 20s and is extremely disrespectful towards my parents to the point where she threatens to hit mother and says abusive words . There were times I have confronted her , but she just starts yelling loud and evades the situation . My dad has tried to confront her about her coming home late and her rude behaviour , but she threatens about calling the police if anyone tries to yell at her . She has written quite disrespectful things to my mother via phone messages , which I had taken the snapshots of just incase there is need in the future to protect my parents . Now her new demand is that my parents send her abroad for studies which my parents cannot afford right now . Due to this she has been using profanity towards my mother and my father . She has made our lives living hell . I really need a solution, she quarrels every 2nd day with my parents and has spoiled the very atmosphere of our home . Can someone please suggest a solution from the legal point of view ??? thanks in advance .