After the serious traffic accident in Barsinghausen in the Hanover region, a second injured child died.
A two-year-old died at the scene of the accident on Friday.
Now the six-year-old brother succumbed to his injuries in the hospital on Saturday night, the police said on Saturday.
There are investigations into a prohibited vehicle race, it was said.
In the accident on Friday afternoon, a 39-year-old driver overtook several vehicles and collided with various cars from oncoming traffic.
Among them was the oncoming car of the family of four, in which the two small children were sitting.
Another four people were injured.
Suspicion of illegal street racing
According to the first findings, according to the investigators, there is a suspicion that the woman has delivered an illegal street race.
As the police announced, the 39-year-old driver initially intended to overtake the car of a 39-year-old driver in a curve.
This accelerated and the two vehicles drove side by side for a longer period of time.
Later, the woman collided with the car of a 50-year-old man, who left the road with his car to the right and came to a stop in an adjacent field.
She then reportedly collided with the family's car, which was thrown off the road to the right by the force of the impact, overturned and came to rest on the roof of an adjacent paddock.
Most recently, the woman collided with the car of a 74-year-old driver who was driving directly behind the family.
The 39-year-old woman who caused the accident, the 50-year-old driver and the children's parents, a 29-year-old woman and a 37-year-old man, were seriously injured in the series of accidents and taken to hospitals.
The other two people involved in the accident were uninjured.