Fill out the Statement of Registration of California Support Order (FL-440) and attach a filed copy of the support order or income withholding order. Child support is legally required for separated parents in California.Contra Costa County Department of Child Support Services. Address. 50 Douglas Drive, Suite 100. The Geller Firm can calculate, negotiate, and settle your spousal support dispute under California law. For assistance on a Child Support issue, contact our office today (925-258-2020) and setup a consultation with one of our Family Law Attorneys. This can help you avoid unnecessary time off work to appear in court and any attorney's fees associated with an unnecessary appearance. All family law paperwork must be filed at the Family Law Center in Martinez, CA. Offers free interpretation service to parties who request in advance. Do I Need a Family Law Attorney in Northern California to Collect Overdue Alimony? What is Alimony Based On in California?