this!
such a situation puts far too much stress on you, it's unhealthy in the long run.
if you cannot move out on your own just yet, maybe you have other relatives where you could go live for a while instead?
at any rate, if a sibling goes on about how he hates you and does retarded stuff at an age of over 18, it's pretty clear it won't get better in the future.
I'm really sorry you are in such a shitty situation and your parents are no help.
(I'd expect them to throw him out with such behaviour.)
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