Board Thread:Theories/@comment-24894791-20160325014734/@comment-5774380-20160325200141

75.176.164.75 wrote:

Uh, I'm pretty sure that it's common knowledge that they're relatives by now... least among the hardcore fans.

Yeah, that's kind of an open secret. We don't put that in the articles because, "officially", we need a confirmation by Isayama or in the upcoming chapters; but we all know the "branch of the family" Kenny was talking about was Mikasa's father and his family, and thus she and Levi are close relatives. :P