The plaintiff, Terry Moogan, claims that Chet was under the influence of "drugs and/or alcohol" when he allegedly collided with Moogan's car. The papers claim that Tom and Rita are the owners of the vehicle Chet was driving at the time of the incident.
"Despite knowing that Chester Hanks was a careless and reckless driver and a habitual user of drugs and alcohol, they negligently permitted Chester Hanks to operate their vehicle and thus, in addition to Chester Hanks, are responsible for the physical and emotional injuries Mr. Moogan sustained as a result of the accident," the suit alleges.
Last September, the 25-year-old aspiring rapper admitted to having a cocaine addiction in a string of revealing Instagram videos, which have since been deleted.
"A couple months ago I was selling coke [and] doing coke until I couldn't even snort it up my nose anymore because it was so clogged," he said in the videos, where he also revealed that he went to rehab. "I even smoked crack. If I can change, you can change. There is a solution."
ET caught up with Chet's Oscar-winning father at the Bridge of Spies premiere last October, when Tom addressed his son's sobriety.
"As a parent, you love your kids unconditionally," he told ET. "You support them every step of the way. You got to applaud the bravery and honesty when it actually comes out of your own house."