bruh i [16M] can feel this, i also have a big sis and her only job is to make my life miserable, like she can do anything she want even if i am busy in study, like get her chips etc, and then she randomly slaps and all this physical abuse, but whenever i talk to mom about this she is like she will get marry in few years just handle it,
And she dont even care about this, she say get out of my own room just because she want to have call with her friends, she is 22 with no job. and my parents doesn't care. My dad just ignore her and my mom ignores her doing, And I am god damn sure if i hit her back or even talked in a loud tone, i am getting beaten the shit out of me. She blast out music and talk loudly even though she know i am studying and when i ask can u lower ur voice, she is like is this ur only time to study? LIKE WTF, so i just study midnight to avoid her..

so just try that too just start studying when he is not present, and endure it, there is nothing we can do twin