Not only did Ethan Couch kill four people during his drunken joyride last June, but he injured a 13-year-old boy whose family has filed a civil lawsuit against what their attorney calls "profoundly dysfunctional parents" who "improperly set no boundaries."

Lucas McConnell and his parents' attorney believe Couch's family and the 16-year-old's psychologist, Dr. [expletive] Miller, are guilty of "gross negligence," he tells Breaking Celebrity News in an exclusive interview.

As Breaking Celebrity News previously reported, Texas judge R.H. Wallace Jr. recently ordered Dr. Miller to hand over his records of treatment and visits with Couch, which led to his infamous "affluenza" diagnosis.

"We are interested in receiving the documents because of their relevance in helping prove the elements of gross negligence we have alleged against the Couch family and their company Cleburne Sheet Metal. Dr. Miller has testified he saw all of them multiple times and treated Ethan Couch for a number of things," attorney Greg Coontz told Breaking Celebrity News.

"In addition Dr. Miller testified based on his treatment of Ethan, Fred and Tonya Couch, he believes Fred and Tonya were 'profoundly dysfunctional parents' who improperly set no boundaries."

What's more, Coontz claims that Ethan had been abusing drugs and alcohol for years before the deadly crash — which landed him with 10 years of probation instead of any jail time — and it was his parents who enabled him.

"Ethan Couch had used alcohol and drugs since he was thirteen years old. Fred and Tonya Couch knew Ethan had alcohol at their Burleson Retta home where he lived by himself without parental supervision at sixteen years of age. Ethan learned faulty rules – namely 'we have the gold, we make the rules,'" Coontz alleged.

"Fred and Tonya Couch’s lack of action after the traffic stop where Ethan was found with alcohol and a half naked underaged intoxicated girl meant that all conditions were met for the June 15, 2013 tragedy to occur, it was just a matter of time. In fact, Ethan’s criminal behavior, drinking alcohol and taking cocaine, increased afterwards," Coontz added.

McConnell did not suffer extensive physical injuries from the accident, but Coontz tells Breaking Celebrity News he's "seen a counselor on a regular basis since the accident almost a year ago and continues to have nightmares about the event."

Breaking Celebrity News has exclusively obtained McConnell's powerful Victi