In a scene of absolute carnage,Antony,Angelina,Sienna and Veronique were killed and their three other young relatives were hospitalised with serious injuries.
Police arrested Davidson at the scene and charged him with more than 20 offences,including manslaughter,dangerous driving occasioning death,driving under the influence,and high-range drink-driving. He was hit with another 14 charges in April,including driving under the influence of MDMA and cocaine.
Police alleged Davidson had been drinking all day at a party,and moments before the crash had run a red light at the busy Pennant Hills Road before crossing Bettington Road's double lines to drive on the wrong side of the road and overtake another vehicle.
After hitting the children,police said he continued driving about 80 metres before coming to a halt.
Daniel Abdallah,father of Sienna,Angelina and Antony,said the children"were all coming over to get babysat. I told them to go for a little walk,to stay together,you guys should be OK. Give them a little bit of independence.
"This is one in a million. They were just walking on the footpath,"he said.