Sounds to me like your employer isn't complying with the court order. You need a lawyer, and you need to be willing to haul your employer (and I assume, parents) to court in some way.
In other words, you are in a tough spot. Call a family lawyer ASAP.
If you are wage garnished and it is coming out of the check and the employer is not sending it in, then they are subject to penalities and fines. I am assuming you are receiving the support though it is not clear from your post. If that is the case, go to the contempt. Your ex will have to prove that it is being taken out of his wages and his parents are not sending it in and they can be fined.