If you take the brother-sister relationship out, the rest sounds strikingly similar to Bleeders (1997). Are you sure, or are you confused about that part?
Check this : http://www.imdb.com/title/tt0119279/
and this - http://www.imdb.com/title/tt0119279/board/nest/62467017
then let me know.
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"If you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche
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