New York Petition for Adult Adoption is a legal process by which an adult, 18 years of age or older, can become the legal child of another adult. This process is regulated by New York State law and involves a court order. The petitioner must provide evidence of their relationship to the adopted and convince the court that the adoption is in the best interests of the adult to be adopted. There are two types of New York Petition for Adult Adoption: 1) Step-Parent Adoption and 2) Relative Adoption. Step-Parent Adoption involves petitioning to become the legal child of a step-parent, while Relative Adoption involves petitioning to become the legal child of a relative, such as an aunt, uncle, or grandparent. Both petitions involve the court granting a certificate of adoption and the petitioner obtaining a new birth certificate.