Board Thread:Manga/@comment-5774380-20190308225839/@comment-25279441-20190316190414

Tdfern14 wrote: They are 'descendants' from Karl Fritz and the Fritz Royal Family but they branched off from the Fritz Family after the Great Titan War and became the Reiss Family in the Walls of Paradis. The Reiss family IS the Fritz family. No branching off involved. Just a name change for security reasons.

After moving into the walls, at some point, the royal family decided to go incognito in order to protect themselves and installed a puppet king that would bear their name. So they changed their name from Frtiz to Reiss.

King Fritz (the king before the Uprising Arc) is not a Fritz, he's just acting as the Fritz. The Reiss family are the real Fritz family.