Question: are levi and mikasa brother and sister?
Answer: No, Mikasa and Levi are not brother and sister. ... That is around the same place where Mikasa lived when she was born. Mikasa and Levi both have the Ackerman ability's so are clearly related in some way. I think that the family that Kenny talks about was Mikasa's dad, meaning that Mikasa and Levi are cousins of some sort.