If you are looking to revise your child support obligation and the other parent is not cooperating, then file a Request for Orders asking the court to revise the child support as permitted by the prior order.
I'd recommend that you consult with an experienced family law attorney to determine what support may be appropriate under the circumstances and how you may find out the other parent's income and how you can best present your case to the court.
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You could file a Notice of Motion requesting a modification to increase child support, and revise the present timeshare agreement. You will have to file an updated Income and Expense Declaration, your Declaration of Facts, and also provide a copy of the last court order you wish modified along with your Notice of Motion documents. Your ex will have to be served with a copy of these documents, along with a blank Income and Expense form for his completion and filing with the Court. The clerk will indicate a hearing date on the Notice of Motion, and if there is a request to modify the custody/visitation issues, it will be necessary to immediately contact Family Court Services in the Jurisdictional County to schedule mediation prior to the hearing date.
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I agree with Mr. Yomtov. However, I would add that you should keep a calendar indicating the dates the child/children spend with you. If you have other evidence of your having more than a 50-50 timeshare such as witnesses and/or day care sign in sheets, that would help too. You may want to have an attorney run support calculations based upon your current income and the other parent's, before you file a request for orders.