you are the blood son of Ban, in general, nor was he the one who raised you responsibly, it was people in general of the 7 sins who raised you; His father was a bit stupid and irresponsible to take care of a child, but somehow he was there, since you only had him, due to the lack of a mother. Ban was trying to train you with the nunchakos, but it ended up that you turned wrong and got hurt

"Ha! you can't even turn that right, kiddo!"

He laughed, until he realized you were close to crying