Complete a Complaint for Custody (CC-DR-004) to ask to the court to grant you custody. Child Support Administration.Application for Child Support Services. This interview will guide you in completing the forms needed to file for custody. To speak to an attorney about your situation or for assistance with completing forms, call the Maryland Family Law. A legal guardian or third party that has been granted custody of the child can file a complaint for child support against the natural parents. Yes, many of the forms required for filing custody papers in Maryland can be accessed online. Child custody;child support;spousal support; anduse and possession of property (if applicable). Most likely, you'll have to pay a filing fee. If you cannot afford it, ask for a fee waiver.