I just hate my cousin now

So I'm 22 M and my cousin (20 M) started living with me and my parents since 2022 as he got admission nearby. He's so irritating that I can't tolerate him now, watching reels and playing games on high volume, interfering between my parents and even arguing with them, faaltu ka gyaan dena and all. He doesn't even care about the huge amount of money that his parents gave as donation. I even heard him telling his mother how he doesn't get tasty food here. Even my parents are irritated but they don't say anything (because you know Indian parents). I just want to slap him so hard but can't do anything kyunki phir kalesh hoga