I'm so struggling right now
Peace and more peace to you, Kevin! This situation cannot be easy at all for either your parents or you to state the very obvious. Breathe, breathe, breathe slowly and very deeply to connect with the source of peace within you. It exists. Breath is to the mind as reins are to a horse. If you put two guitars in the same room with each other and pluck the string of one of them, the matching string on the other will vibrate. Tune your own guitar first, don't try to fix your brother's. In other words, violence begets violence. And there's already a lot of violence in your home. Don't add to it.
I got angry
The root cause of anger is desire unfulfilled. You write both of current desire for peace in your home and among the family members. Understandable without any doubt. See above for first crack at bringing some peace to the environment. The second desire you write of is to have an attempt at securing a suitable environment to continue your studies. That is a desire for the future. You haven't been denied it yet, so chill on that one if you can.
[my parents say after their death that] it's my responsibility for taking care of him
If I read this correctly, your parents are still living and even have absolved you, for now, of "taking care of your brother." Listen to them! Your first duty, as a son, is to YOUR PARENTS. Figure out what is your duty to them and how you can support them in every way possible with the difficult task they have. Do your duty and serve your parents first and foremost so they can perform their duties to their children. When the time comes, you will figure out if you have and how to perform your duty to your brother.
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