Patrick Maughan, 53, and Owen Maughan, 27, both from Hill Rise in Darenth, are each charged with the murder of Peter Maughan.
They are also charged with causing grievous bodily harm to Peter’s father Lovell Mahon, 24, who suffered serious injuries.
Both men are also charged with the attempted wounding with intent of Peter’s sister and the mum of the children, Hayley Maughan.
Owen Maughan has accepted that he was driving the vehicle at the time of the crash, while Patrick Maughan has accepted he was a passenger.
On Monday (July 7) the pair were due to enter pleas at Maidstone Crown Court.
However, the plea and trial preparation hearing was adjourned and their pleas will now be heard on October 7.
A provisional trial date remains fixed for February 2 next year.
The incident involving two Ford Rangers happened in New Barn Road shortly after 9.30pm on June 2.
Peter was rushed to hospital along with his one-year-old baby sister, Annarica and their dad, Lovell.
Tributes have since been paid to Peter online with many describing him as a “beautiful angel”.
One said: “You were golden, Peter. The family chain is broken and will never be the same without you my boy. Forever 4.”
Another said: “Rest in peace baby. A little angel way too good for this sick, cruel world. Straight to the gates of heaven.”
“So heartbreaking. A beautiful baby boy, rest in heavenly peace, angel.
“He was the kindest little boy and loving child”, a third added.
