Wisconsin JC-1645, Petition for Adoption Child/Adult, is a form used to petition the court for an adoption or adoption of an adult in the state of Wisconsin. The Wisconsin JC-1645 form contains detailed information about the petitioner, the adoptive parent and the child or adult being adopted. It also contains legal information about the adoption process in Wisconsin. The Wisconsin JC-1645 form is used by adoptive parents to initiate the adoption process and by the court to review the adoption petition. There are two types of Wisconsin JC-1645, Petition for Adoption Child/Adult: the Petition for Adoption of a Child and the Petition for Adoption of an Adult. Both forms must be completed in order to initiate the adoption process in Wisconsin.