Board Thread:Theories/@comment-39665740-20190601183755/@comment-37493549-20190603152309

We don't even know if Ackermans can become titans. Kenny's grandfather said they were a completely separate bloodline to the subjects of Ymir.

You would imagine most Ackermans alive in the present story must have subjects of Ymir in their family tree. It would be very hard for the Ackermans to only have children with other Ackermans given their rarity and how the modern Ackermans are mostly unaware of their own history.