The victim's family is also appealing for footage of the accident.
A man tried to get the SUV driver to stop the car.
He is currently receiving intensive care at Tan Tock Seng Hospital.
The devices carried by passengers, crew or via mail for non-commercial purposes are allowed.
The victim's father and five-year-old brother were also struck by the slab of cement.
A consumer who purchased the product "experienced immediate and effective results".
One of the pilots who operated the drone did not possess an unmanned aircraft pilot licence.
He spent about 5 minutes outside the door and tried to unlock the gate three times.
Mr Lee Hsien Yang is "trying to create a false urgency" by pushing for immediate demolition, the Government said.
A white Hyundai had stopped in the middle of the road.