Younger brother's torture

I'm 25 years old and I've been staying another city for my study purpose. In my home my parents, one younger brother(22) and younger sister(16) stays. My younger brother aged about 22 years old has been torturing and troubling us since last few years. And now a days it's on the peak. He doesn't obey anyone, is not afraid of anyone and doesn't respect anyone at all. He drinks and does some kind of drugs, comes late at night at about 12 or 1 am, wakes everyone up from sleep with his drunk blabbering untill he falls asleep. He is angry most of the time and demands money making false excuses. Abuses father and mother, throws stuffs in the home, breaks things etc. He even broke our TV and other furniture. Time has come that he has gone extreme and doesn't care about anyone. When he is told to leave the home, he says he needs the property of his share first and then he would leave. Whenever he demands something he needs it right at that moment. Few years ago, He wanted bike, he was bought one, but he sold it himself after few days and then bought a second hand bike. He met with an accident with another biker while he was riding being drunk and we had to pay the other biker for his damages. We sold the bike after that but recently he is again asking for bike and torturing a lot mom and dad about it. We are not rich. My dad is just a primary school teacher and he is a respected man in the society but due to my brother he is losing it all. He is always tensed about him and seem to lose mind about what to do. He sometimes wants to leave the house because of him, sometimes even wants to suicide because of his torture. We have been hoping he would be good, but with time passes, he is becoming extremely worse and terrifying. What can be done?