TITUSVILLE, Fla. (AP) — A 16-year-old boy who is the subject of an FBI investigation into the death of his older stepsister on a Carnival cruise ship last month never had permission from his father to go on the trip, the dad said in family court papers accusing his ex-wife of failing to supervise the teen.

The teenage boy and his 18-year-old stepsister, Anna Kepner, were allowed to share a room aboard the cruise ship and the boy’s mother “failed to properly supervise” the teen, the father, Thomas Hudson said Thursday in a court motion seeking greater visitation with the two children he shares with his ex-wife.

Kepner was found asphyxiated under a bed in the room she shared on the ship with the teenage boy, Hudson said in the court documents.

Her death was ruled a homicide, according to

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