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Let me see if I can help. You should be considering applying to the court for a non molestation order to provide you with the protection which you need from him. You can apply on a form FL401 - you may if you are living together wish also to consider applying for an occupation order to remove him for the property. I have attached a link to the government's website which explains the process - https://www.gov.uk/injunction-domestic-violence/eligibility-non-molestation
I hope this helps
Then you must contact the police. You can however get the non molestation order against your sister.