"...What?"

In shock and confusion at what you just said, all Chūya could do was stare with his lips parted, with the inability to move an inch as he processed this newly-found information in his mind.

"... Are you serious?"

Chūya already believed he had no family—if he had any, they would've already been dead before he knew of it. Yet here you stood, all well and alive despite your absence in his life—he doesn't exactly remember you but the familiarity is there.