Sean Williams, 33, Jennifer Vojinovic, 27, and 17-year-old Davonta Williams face numerous charges, the most serious being murder and attempted murder.
They were denied bond Thursday.
Andre Vasquez, 16, was killed. His mother, Krystal Hethcoat, remains in the hospital. They were both shot in the head during the attack at their Northwest Side home in the 3400-block of North Lawndale.
After getting a first-hand look at the three people accused of shooting their relatives, the mother of Krystal Hethcoat and grandmother of Heathcoat's son Andre, broke down in the lobby of the criminal courts building. The family had no comment.
Prosecutors said the trio targeted Hethcoat's northwest two-flat looking for drugs and a gun while Vojinovic stayed in the getaway car, the Williamses allegedly broke into the home when Hethcoat's 14-year-old daughter opened the door to leave for school.
"When she opened the door the two male offenders using guns and masks entered, forcing all three victims to the ground," said Cook County assistant state's attorney Jamie Santini.
Santini told a judge that Sean and Davonta Williams, who are not related, forced Hethcoat, her 15-year old-son and the daughter to the basement, where the offenders duct taped the victims hands.
After robbing the victims, Sean Williams, 33, shot Hethcoat and her son.
The girl was able to free herself of duct tape and ran outside to allert neighbors of what happened.
Witnesses helped track down all three suspects. One witness saw Sean Williams hide a weapon in a nearby bush. Another witness was able to give police a partial license plate of the getaway car. Police said all the witnesses positively identified the three suspects.
