After a complaint has been filed against you, you may file a written complaint against the party suing you as long as the subject matter is related to the original complaint. You must still file an answer as well to the complaint against you.
Answer and Cross Complaint includes the following:
Consult with attorney
Drafting of Answer and Cross Complaint
Child Support Calculation
Certificate of service to opposing counsel
Filing of all documents with the Court
Complying with deadlines