Opinions wanted

[Sejanus]

I tried not to involve my parents, but my sister was adamant they should defend her, so they got dragged in anyway.

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I agree that your sister is being ridiculous and inconsiderate, especially given the circumstances of your new job. It sounds like she has a problem respecting other people and a lack of empathy. I went through something similar with a brother who would play loud music all day every day, and into the night. When I asked him to turn it down he did so for about 5 minutes, then turned it up again. My parents did nothing to stop it.

I wish I knew what the answer is, I hope you can come to some agreement but I certainly feel she is in the wrong from what you say.

I think your both your brother and my sister have a terminal case of immature-itis.