From The New York Times [caution note: this news outlet treats altering gender as if it is acceptable]:
Jessica Bradshaw found out that her 15-year-old identified as transgender at school after she glimpsed a homework assignment with an unfamiliar name scrawled at the top. When she asked about the name, the teenager acknowledged that, at his request, teachers and administrators at his high school in Southern California had for six months been letting him use the boy’s bathroom and calling him by male pronouns.
Mrs. Bradshaw was confused: Didn’t the school need her permission, or at least need to tell her? It did not, a counselor later explained, because the student did not want his parents to know. District and state policies instructed the school to respect his wishes.