Criminal charges may be filed against a stepsibling of 18-year-old Anna Kepner, a Florida high school cheerleader found dead aboard a Carnival cruise ship earlier this month, a new court filing suggests.

The disclosure appears in an emergency motion submitted in a divorce case involving Kepner's stepmother, Shauntel Hudson. In the motion — which seeks to reschedule a hearing in the proceedings — Hudson's attorneys write that she has been told by FBI investigators that "a criminal case may be initiated" against one of her minor children.

"An extremely sensitive and severe circumstance has arisen wherein the Respondent/Mother will not be able to testify at the hearing at this time," the filing states.

CBS News has reached out to Hudson and her attorneys.

Kepner was on a family vacati

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