Twitter Removes Trump's "Photograph" Tweet
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Private School Students Protest with Lock-in
A family likely cannot get the principal to remove the story due to the legal reason of invasion of privacy. However, as journalists, ethically, you should consider the feelings of the family in your publication, and treat the issue with respect, focusing on the life of the student, rather than their death.
The Free Speech Clause of the First Amendment protects your expression. But, the First Amendment also has an Establishment Clause, which bars any government actor, like your public school, from promoting an establishment of religion. In general, schools have wide authority to shut down speech solely because it is religious. Whether they can shut down speech under the Establishment Clause or if it is protected under the Free Speech Clause depends on two questions: (1) whether the students hearing the message are a “captive audience,” and (2) whether the student’s statement constitutes religious speech.