A 15-YEAR-OLD girl whose family was murdered while she was overseas on a school trip learnt of their deaths on the social networking site Facebook.

A friend of Brenda Lin, who is the only surviving member of her immediate family, posted the horrific news on the schoolgirls Facebook page.

Min and Yun Li Lilly Lin, their sons Henry, 12, and Terry, 9, and Brendas aunt Yun Bin Irene Yin, were bludgeoned to death while asleep at the familys home in North Epping, Sydney, on July 18.

Police are yet to make any arrests.

Brenda had been due to arrive home from a one-week school trip to New Caledonia on July 20, but as a result of the news, the group returned a day earlier.