You CANNOT give back a summons. You should only accept a summons for someone who lives with you. Once you accept the summons, that person has been served, and if that person does not respond to the lawsuit, that person will be defaulted and probably lose the lawsuit automatically. If you have already accepted the summons, find your son-in-law and give him the summons and petition immediately.
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I agree with Mr. Rose's answer and just wanted to emphasize that you must find him and give him the papers. Surely, you can find out where he is with a few phone calls. If you cannot locate him at all, perhaps it will be time to inform the other side of the circumstances, as well as the judge.
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