The father of a man charged over a car crash in Sydney's south-west that killed a brother and sister has been accused of hindering the investigation.
Police said a black Mercedes and a Toyota Echo collided head-on at about 9.20pm on September 1 on Sadleir Avenue, Heckenberg, before the Mercedes hit a Toyota Rav4 and flipped on its side.
The driver of the Echo, 24-year-old Alina Kauffman, and its passenger, her 15-year-old brother Ernesto Salazar, died at the scene.
READ MORE: Warning for shoppers as El Niño looms
Johnson Kokozian, 20, was charged with two aggravated dangerous driving occasioning death over the crash.
He was also charged with driving in a dangerous manner, negligent driving occasioning death, two counts of failing to stop and assist after vehicle impact causing death, as well as driving while disqualified.
The matter came before court yesterday, though Kokozian himself did not appear after he was denied bail on the weekend.
READ MORE: US student dies after 'One Chip Challenge'
Police arrested a 22-year-old woman, Kokozian's girlfriend, outside court yesterday and charged her with concealing a serious indictable offence and hindering an investigation.
A 21-year-old man, arrested at his Liverpool home earlier yesterday, has been charged with the same offences.
Kokozian's father, 61, has also been charged with concealing a serious indictable offence and hindering the investigation after he was arrested yesterday.
He was granted conditional bail and will appear before court on October 19.
The investigation continues.
