The pair were fatally shot while sitting in their red ute at Guildford early on October 20, 2021 in a suspected gangland shooting.
Salim, 18, died in the vehicle. His 64-year-old father died later in hospital.
NSW Police formed Strike Force Ormerod to investigate the murders.
The newly-released CCTV shows a silver Lexus SUV stopping on Osgood Street, Guildford, before a man – dressed in all black and wearing a balaclava – leaves the vehicle and runs toward a parked red utility.
The man falls over, before getting up and shooting into the parked red vehicle, where Toufik and Salim were sitting.
The man then returns to the SUV as the driver begins to drive off, before coming to a stop and firing more shots from their vehicle into the ute.
Four men – aged 20, 25, 18 and 23 – have previously been charged over their alleged roles in the incident and remain before the courts.
NSW Police will give an update on their investigation at 10.30am today in Sydney.