Elliott Bower, 18, has admitted causing the deaths by dangerous driving of four people, including a 16-month-old boy, in a horror car crash in Sheffield.
Bower was driving a VW Golf which crashed into a people carrier as it was being pursued by police in the Darnall area of the city last month.
Adnan Ashraf Jarral, 35, died along with his 16-month-old son Muhammed Usman Bin Adnan and a married couple - Vlasta Dunova, 41, and Miroslav Duna, 50.
Bower pleaded guilty to four counts of causing death by dangerous driving and other offences at Sheffield Crown Court on Monday.
He appeared alongside his brother Declan Bower, 23, and a 17-year-old boy, who each pleaded guilty to offences including aggravated vehicle taking.
- All three defendants will be sentenced on January 28.