[{"role": "user", "content": "I'm trying to communicate with a friend from Italy about a mutual acquaintance, and I was wondering how I could say 'I know your sister' in Italian so we can have a smooth conversation."}, {"role": "assistant", "content": "The translation of 'I know your sister' in Italian is 'Conosco vostra sorella.'. You can use this phrase to let your friend know that you are familiar with their sister."}]