To respond to divorce or legal separation papers (a Petition), your first step is to fill out a Response form. Guide to California's FL100 Divorce Form: from understanding its essence, and meeting state requirements, to consulting a family lawyer.You should consult with an attorney to determine in which county you should file. You will need to complete a Petition of Divorce form as well as any other relevant divorce forms to your case. Below you will find information about the services we offer and addresses to our Oakland and Tri-Valley office locations. Learn about Dissolution of marriage on California today. Quickly find answers to your Dissolution of marriage questions with the help of a local lawyer. One spouse files a Petition for Dissolution of Marriage and Summons and has a third party personally serve the other spouse. There can be a lot more to think about than just ending the marriage and filling out court papers. Ensure plaintiff or defendant has resided in the county in which the complaint is filed for 10 days immediately preceding the filing of the complaint.