The teen's 24-year-old sister was behind the wheel of the vehicle and survived the crash.
The victims of the fatal crash include Samah Deis, 15, and her parents, Nazmi and Wafieh Deis, 62 and 49 respectively, of Tinley Park.
The accident took place around 8:30 p.m. Sunday near the intersection of 171st Street and LaGrange Road in Orland Park, less than a mile from the family's home.
Authorities confirm the family was returning home after dining at a nearby Olive Garden when the unexpected happened.
Orland Park police say the collision occurred as the family's Camry turned left onto eastbound 171st Street. That's when officers say the driver of a street sweeper, operated by Mokena-based Midwest Maintenance, heading northbound on LaGrange Road, struck the vehicle causing it the careen into a 1998 Ford Ranger pickup truck that was stopped at the light eastbound on 171st. The Camry was crushed and the street sweeper was knocked on its side.
On Monday afternoon consolidated High School District 230 expressed its condolences to the family and friends of the Andrew High School freshman as friends and neighbors struggle to cope with the unexpected loss.
"They are a good family," said Hailey Williams, a former neighbor of the family. "They are always nice."
In a statement, school officials said, "The school community has rallied to support each other in a very difficult time. Social workers and guidance counselors are available for those who need to talk to someone...We extend our condolences to her family and friends. Our hearts go out to them as they cope with their loss."
The driver, the street sweeper and the two people in the pickup truck with treated and released from the hospital.
Police say there is no indication that alcohol or drugs played a role in the crash. No charges have been filed.
APRIL 17 UPDATE: The driver of the street sweeper has been cited with running a red light. The driver has not been named. Police say they are still waiting for toxicology reports that have been sent to the Illinois state lab.