My brother won't work or even look for a job. He has been jobless for 2 years.Thinks he has already worked eno?

enough, my mom has a heart condition that she just recently found out about (Cardiomyopathy) she is a single mother who has taken care of me (17 years old) and my older brother (22 years old) the best she possibly could without help from my father. Now that my moms boyfriend is gone we can not afford our house that we have lived in for 17 years. My brother refuses to get a job and help financially because he claims he did enough help when he worked for 4 years (only job he ever had) I am 17 and work almost full time AND go to school with great grades, I pay my mom every 2 weeks from my paycheck about 75% of it. I have tried and said everything possible to motivate my brother for the past 2 years and he says that me and my mom always bash on him everyday and that he does so much work around the house... He vacuums and mops and does dishes.. He sits on his *** all day and eats our food that WE have to pay for so the least he can do is clean.. But he seems to think if he gets a job no one will clean? Makes no sense.. I even told him we would all 3 help with the house chores if he would just provide some income help. That is all we have been asking for. My mom only makes 1100 a month and the mortgage is 900. I pay about 400 a month total because I also have my life to worry about.. (Car,clothes,work,school) can't all revolve around my family not to mention I only make 350 every 2 weeks working at a local PizzaHut. My mom has been paying for his cigarettes for the past 2 and a half years... He is in to my mom for about 1100 dollars. He won't even go look for a job and when we even say a word he freaks out with anger and disrespects us in a very rude fashion (**** you,*****,idiots,etc...) very hurtful toward my mother who is 52 and could die at any time of her life due to her bad heart. He thinks he has to have weed to keep him sane all day which I have to pay for. If he doesn't get high it's like a crazy person pacing through the house yelling and bitching at me and my mother. He is in my opinion deliberately mooching from us and I want him out. We cannot afford a 3rd grown person to sit and eat all day while showering twice a day and staying up all night using the electricity.. How can we go about removing him from the home and having him evaluated by a psychiatrist because all of his actions point toward Schizophrenia and I am worried if we leave him with no where to go he may hurt himself. Please explain to me some good ways of taking care of this horrible stressful situation. Help!!! PLEASE!!