We need more information to know for sure if the father of Ethan Crouch had anything to do with his son's disappearance, but if he did he should certainly be held responsible. While it is important that parents support their children, they have crossed the line when they support criminal behavior such as missing probation appointments and fleeing.
It is the parent's responsibility to care for, and protect, their child. Even if the child has gotten themselves into a terrible situation or circumstance, like drug abuse or teen pregnancy, the parent should do what they can to care for them and help them. If the child goes missing, the parent should be questioned. How could this happen? What were you doing?
While I do agree that his upbringing played a major role in his current state of mind and belief that he is about the law, I do not think that his father is to blame for his disappearance. If Ethan thinks he is old enough to responsibly drive while under the influence, then he is certainly old enough to understand the terms of his probation. However, I do not excuse his parents' behavior whatsoever.
As the search rages for Ethan Couch - the "Affluenza" teen convicted of killing four pedestrians in June 2013 near Fort Worth, Texas - many eyes have looked to his father, Fred, as a possible accomplice in his flight. While Fred Couch may have contributed to his son's delinquency and addiction with poor parenting, authorities say Fred has cooperated with the investigation and report that, in fact, Ethan's mother has gone missing and is likely aiding the teen. Therefore, it's Ethan's mother - Tonya Couch - who must answer for her role in his run from the law.