My sister is an absolute terror, for the last year she has become worse and worse. She has been smashing the house and being physically abusive and I just don't know what to do.
It's my mums birthday today and she's called her an alcoholic cunt for drinking a glass of wine and punched her in the face for telling her to stop picking on our little brother 
Can the police do anything? My mum doesn't want to call them incase she gets a criminal record