Need help with my dad and brother who're both alcoholics, what should I do?

Hi please bare with me, I'm a 20 year old student, my mother passed away a decade ago, I live in my university town but during breaks I stay back at home where my father and one of my two brothers live, I've been back 5 weeks studying for upcoming exams, my father, 60 and brother, 25 are both alcoholics. My dad works 5-6 days a week quite hard and drinks every single night in his room. My brother, is a 25 year old unsocial unemployed estranged person who drinks every night by himself into the late late hours of the morning. He isn't really unemployed I think he doesn't want a job because he's so unsocial and strange, nobody understands him, we think he has a personality disorder, lazy, unsocial, deceiving, dishonest, awkward. When he hasn't got money for drink he tricks my father into giving him money 'for things for the house' (Bread, Milk etc..) my dad generally worries for him and doesn't want to give him money but when he's pissed at night he gives him money and then my brother can buy the many cans of beer he needs. His bedroom is full of empty cans, we've tried reaching out to him and helping him he won't have ANY of it, he just wants to live this life which he has been for years, my father has heart disease and drinks every day. I'm stuck in the middle of it here getting me down, these two just get at each others feet all day, sometimes picking on each other for their drinking habits, and drink alone in their rooms every night. Don't know what to do. Sorry for so much reading but I need help, thanks a million.