I have reached the point where i'd perish him... forever

Hello everyone, My name is Malik - I am 20 years young, very motivated about life and have attained many great achievements such as, losing over 100lbs and being published in over 4 countries on various newspapers related to weight loss/running/marathons. I am passionate about running, I could run forever :) Now, here is the issue and I really need help to cope with this situation.... It has been going on since 20 years! My parents have been married for over 25 years - My father right now is 50 and mother 45. In 1998, through the HARD work of my mother, she saved 1 million US Dollars, then we migrated to the United States and they did hotel business and thanks to my fathers mistake, in 2005 "They had 30 dollars in the bank" and nothing else and under millions of debt (I am making this short) and now 2010 My father acts the SAME like he did 20 years ago, he has been doing this same pattern for 20 years... he works for 5 days at a job, quits, my mother is the one still making the money since all these years... she has spent over 300,000US dollars on my fathers stupid "TRAVELING mistakes" the pattern is he stays in one country for few months then runs back to another and runs back to another, he is doing this for 20 years!!! and when he wants to leave, he makes the entire family misreable, curses, insults, he takes 6 different medications and he is chemically imbalanaced by what doctors said, for me I know he is "NOT normal" he is verbally abusive to me (son) and my mother, she literally cries EVERYDAY and I am just a student and it hurts me so bad to see this and this is not new... 20 YEARS!!! daily... fights over money because he has none and wants to go here and then another country and my mother always gives him and now my mother is at the edge.. she says she is tired of supporting/working all these years, lost million and working hard again and owes debts to others and then my dad is always concerned with his shit.. and I and my dad have had physical fights many times, even today August 18th 2010! and this happens daily... I past 6 months have threated him in anger that you are in danger, I will k"ll you and I really think if my anger reaches so much because in that situation seeing him cussing and my mother crying, and he hit my mother I will really do it.... and I am so so sad and frustrated right now.. .that I really am thinking of ways to do it... I don't want to but I need advise... I have big dreams and goals in life and I am certain to reach them and I do not want to make a mistake but.. if anyone was in my shoes... they would feel going through the mental torture daily..... it is unbelievable....... I AM SO TIRED OF THIS!