NY family law attorney Ken Jewell explains the process for modifying custody in New York. He explains that if the parties cannot agree on modifying custody, the proper course is to file an application with either Family Court or Supreme Court, detailing the circumstances under which one or both parties seek to reorganize custody. Alternatively, if the parties can reach an agreement, they can have a formal agreement drafted outlining the new custody arrangement. Once signed, this agreement is submitted to the court to be “so-ordered,” which converts it into an official court order, making the custody arrangement legally recognized and enforceable for purposes such as child support.