What is the name of your state? illinois -How do you go about getting the father's name legally on birth certificate? Father pays voluntary child support and has visitation with child has often as possible,but for future security would like to be legally on certificate. Mother will not just sign voluntary paternity. The child is now 5yrs. old. Whose to say if she just decides to move out of state or has some other man adopt or Father passes away How would child receive SSI benifets. PLease Help!