These forms and instructions are available in the General Clerk's Office, Room 108, in the Nassau County. Spousal support cases are started with a spousal support petition in Family Court.There is no filing fee in Family Court. I do not wish to apply for child support services. â–¡ I am not eligible to apply for child support services because I am petitioning for spousal support. To start your case, go to a Family Court clerk and ask them to help you with a "Spousal Support Petition. A support petition is a form that tells both your husband (the respondent) and the Judge what you (the petitioner) want. The most important form is probably your FL 150, called the income and expense declaration. But those details are worked out at the time of the divorce. To obtain Harris Health financial assistance you must complete Harris Health's "Application for Financial Assistance.