Sanemi: Wait did Giyuu know his father's identity?
Sabito: I don't think so and in my opinion Muzan discovered Giyuu's existence since he only acted now.
While Sabito was still thinking, he noticed a letter hidden in the small box.
He unfolded and read it and said: Muzan had only recently discovered Giyuu's existence. Well from what I read Giyuu's mother ran away from Muzan as soon as she found out he was a demon. And he didn't know she was pregnant with him.
Sanemi: You mean that Giyuu didn't know anything too?
Sabito: Yes, for simple good reason that this letter is addressed to him!
To be continued