ABC

Anna Kepner ’s grandparents are shutting down any talk she was scared of her stepbrother -- the teen reportedly under investigation in her cruise-ship death -- making it clear they have faith in his innocence.

In an ABC News sit-down interview, Barbara and Jeffrey Kepner said 18-year-old Anna and her 16-year-old stepbrother were "two peas in a pod," and cared for each other "in the right way" -- a far cry from what Joshua Tew , Anna’s first love, claimed ... saying her other brother told him about a nasty blowout the pair allegedly had inside the cabin they were all sharing.

The grandparents say authorities told them the stepbrother is considered a suspect in the case. They admit they’ve got no clue what actually went down inside that cabin -- they’re waiting on answ

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