Some researchers at University of California at Santa Barbara found what they believe to be innate brain guards against incest with a sibling, based on whether or not you saw that sibling cared for by your mother, basically discounting Freud's whole Oedipal complex theories.  It's in this week's issue of Nature. 
I wish there was more to it than just a series of surveys, though.  I'd be curious to see if there is any brain basis for the development of these categories of relationships.  Interesting stuff nonetheless.
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