The civil lawsuit by Joey Leos against Joanna Cloonan was filed in Orange County Superior Court. It also names the shooter, Marcus Anthony Eriz, who is serving a prison sentence of 40 years to life for the shooting of Aiden Leos.
Gunman found guilty of murder in OC road rage shooting that killed 6-year-old Aiden Leos
Aiden was sitting in a booster seat and was struck by gunfire when Eriz fired at his mother's car.
The boy's father alleges in the suit that Cloonan's aggressive driving provoked the deadly shooting.
Mother of Aiden Leos gives tearful testimony about deadly OC road-rage shooting
Eriz's girlfriend, Wynne Lee, who was driving the car at time, and Cloonan's mother are also named in the suit.
It goes to trial this spring.