Good evening Susan,
I'm Doug, and I'm very sorry to hear of your son's situation. My goal is to provide you with excellent service today.
There is no use in you going in his place as the court will not hear anything that you have to say. And, as the service of process was never perfected----your son was never personally served, his is not at any risk either. The court will not grant a default against him if he has not been properly served.
If a default judgment was entered against him in the past---even though he was not served, then he can apply to the court to have the default set aside. And if there was a default, then I suspect that the hearing tomorrow id a creditor's deposition where they would want to ask him about his assets, bank accounts and employment. But again, if he was not personally served with the summons, then he will not be in any trouble for not appearing.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
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I wish you and yours the best in 2016,