The House Of Screams

Hello. I am looking for advice and guidance about my situation because I need an objective point of view. Ours are divorced, I live with my brother, mother, aunt and grandmother. The first problem is that my grandmother is already years old and does not maintain any hygiene unless she is bathed by force, and leaves traces everywhere, I guess, you guessed it. This is the most common reason for scandal, because even if it is cleaned, the probability of recurrence on the same day is very high. We live together because the apartment belongs to my grandmother, so there is no need to pay rent, but there is nowhere else to go. My brother and I are students, which I will explain later, and my mother and aunt do not earn enough to support themselves, our food comes mainly from rents. Mentioning this, my mother has changed many professions, but has been working as a security guard for about a year and a half. The salary is not high, but it is still something. The bad thing is that it affects her psyche very badly - she has to watch many cameras for 12 hours. That's why when she comes home, she is contactless even after that. If you ask her how she is, she would swing sharply and / or scream at you. I gave up the practice of communicating with her, from an early age this idea seemed strange to me for one reason or another. Let's go to my brother - two years older, depressed and without much motivation for anything, at least for learning. I think this comes from the fact that my mother has been telling him all his life that if he doesn't study and doesn't get good grades, he will end up digging in the buckets. He tried to exercise it on me too, but it didn't work. He doesn't like his specialty, which is not very easy anyway, and requires you to understand at least a little bit of higher mathematics. Since he failed to take many exams, interrupted for a year. I study computer science, respectively I understand the necessary mathematics, and I was asked to help as much as I could. I agreed on the condition that he try to review the material himself, and then together clarify any inaccuracies in order to grasp the algorithms for solving them. I couldn't spend more time with him because I have my own exams, and I'm studying programming outside of school to focus better. Unfortunately, this plan failed miserably because he refused to sit alone, and I had to attend, sitting and reading with him. When I tried to explain that there was no way it could happen, my whole family started accusing me that he would not take any exams for me and his whole studies would go to the movies. Most of all, he tries to make me feel guilty. I offered to take private lessons with a neighbor, but he flatly refused. I can neither study nor take his exams instead. This tension prevents me from concentrating on my own studies and going out to study so that I am not here. Only there do I find some peace. Please advise me what to do because I am really desperate. Thanks in advance for the answers.