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I agree with needinfo. You may have a valid case against him, but how will this affect your relationship with your wife and family? Lawsuits against an employer can get ugly (especially when it is your father-in-law). When he finds out he is being sued, he will probably dig up as much dirt on you as he can.
Did your wife bring to his attention your need for ordering meds from OP's? Or did you tell your fellow co-workers about it?