User blog comment:Xilinoc/Ch. 651 - The Theatre Suicide SCENE 5/@comment-26258-20151112212754

So, is Kyōraku Kyōkotsu father? I mean he said Katen gave birth to Kyōkotsu and we all see the way they act around each other, I think Kyōkotsu is all the evidence we need to answer the question "Did Kyōraku bang his sword?".

jk