The young female relative of accused murderer Lian Bin "Robert" Xie, who was allegedly sexually abused by him after the crime, says she had "loved hanging out with him" before the killings, as he had "paid attention to me".

The woman, who cannot be identified for legal reasons, is a prosecution witness in Mr Xie's trial for the murders of five members of the Lin family of North Epping in the early hours of July 18, 2009.

Lian Bin "Robert" Xie and his wife, Kathy Lin, in a file picture. Credit:Danielle Smith

The Crown alleges that, in the 12 months before the alleged murders, Mr Xie "groomed" his young relative.

After the killings, Mr Xie allegedly began sexually abusing her on a regular basis – as often as twice a week – over a 20-month period.