Board Thread:New on Tokyo Ghoul Wiki/@comment-173.225.194.108-20160123222633/@comment-25955276-20160126034315

Okay, to tl;dr this:

All kakujas became kakuja because they ate ghoul.(except seidou takazawa, who got implanted with a kakuhou from guy that ate ghoul)

It could be possible that you can be kakuja if your parents are kakuja, but no kakuja has had a child(except for yoshimura, who wasn't a kakuja when he had his baby)