Salim Hamze, 18, and Toufik Hamze, 64, have been shot whereas sitting in a automotive in Guildford final October.
Salim died on the scene, whereas Toufik was taken to hospital, the place he died.
Salim, 18, was considered a low-level participant in an organised crime community, together with his dad an harmless social gathering caught within the crossfire.
Earlier this 12 months, detectives charged a 25-year-old man over his alleged function within the incident.
He stays earlier than the courts.
Now, a 20-year-old man has additionally been charged with two counts of homicide.
Police have alleged he had direct involvement in planning and coordinating the vehicles used within the capturing.
The 20-year-old was arrested at a Grafton jail at about 1pm yesterday.
He'll face courtroom immediately.