My daughter is 6 years old and after 6 years of battleing with her Father about signing the birth certifcate, he finally signed an acknowledgement of Paternity last week. My question is once he is added to the birth certificate will her last name automatically change to his or Do I need to get a letter notarized saying he does mind it staying the same? How do I go about making sure her last name staying the same as mine. He said it doesn't matter to him.

