The victims, a couple, their five-year-old child, and their neighbor have been identified as Ashok (30), his wife Kiran, his son Ishant and Jawahar Singh (93), all residents of the Najafgarh area.
The couple's two-and-a-half-year-old child was injured in the accident and has been transferred to hospital. His condition is said to be critical.
According to a preliminary investigation, the accident was caused by a negligent driver.