Because you are in sydney you have to send a letter by email to the court and also call them telling them you need an adjournment because you were served yesterday and you are in sydney.
You will have to appear on the next occasion and oppose it and the court will set it down for a hearing.
The court will adjourn it for you because you have not been given enough notice.
You will need a solicitor to represent you as this will go to a hearing.
Your sister will have to report the assault to the police and they will deal with that separately.
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