The mother of the American teenager wanted for violating his probation in a deadly drunk driving crash is scheduled to be arraigned Friday in Texas.
Tonya Couch arrived in Texas Thursday from Los Angles where she has been held since she and her son were arrested in Mexico more than a week ago.
Couch is charged with hindering apprehension.
Ethan Couch's lawyers filed a petition in Mexico that could delay his extradition back to the U.S. for weeks.
Couch was 16 years old and drunk when his car slammed into an SUV, killing four people two years ago.
He pled guilty to intoxication manslaughter and was sentenced to 10 years of probation.
The case gained notoriety because Couch's lawyers used what was termed the "affluenza" defense, calling experts who convinced the court that Couch was too spoiled and pampered by his wealthy parents to understand the severity of his actions.