Because of her general size and shape, many people question whether or not Khloe Kardashian is Robert Kardashian's biological daughter (and a biological sister to Kim). Robert's ex-wives are claiming that she isn't, but he swore that Khloe is in fact his daughter in a past legal document. According to TMZ:
When Robert was seeking to have his 2nd marriage annulled from Jan Ashley in 1999, he submitted a declaration to the judge stating that the marriage did not work because Jan wanted to have his child ... but he did not.
In the declaration, Robert says, "I decided that since I already had four biological children, I did not wish to have any more."
So there you have it. She might look like an atrocity compared to her sisters... but she is related to them, plus she married someone successful and doesn't do crazy sh*t all of the time that makes me want to suffocate her in her sleep. I think we all know the true winner of the gene battle, here.