Mother said child was mine born at end of August 2018 and we both went to lab and had DNA done with court approved results indicates the child is not mine
You are speaking of a Disestablishment of Paternity and must be filed in the court that has jurisdiction over the child support order. There are requirements to give notice, an affidavit, and presenting the results of the DNA test. I advise hiring an attorney to represent you. If you do not get the paternity disestablished, you will have to pay child support.
This is a court action called "Petition to Disestablish Paternity" although you haven't technically been adjudged the father, in order to amend the birth certificate you will need a court order. Thus, this legal proceeding. A family law lawyer will be able to help you.
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You may want to file for a disestablishment of paternity, to protect yourself from being the presumptive legal father in child support or other legal proceedings.
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