What? Are they cousins? Can someone explain me what happen (=・ω・=)

I am not sure....I guess they are cousins or something but Sha Hu Rong and Sho Wang are adopted. So they are not actually blood-related. Well, Chung is also adopted but I am not sure if he is actually blood related to that guy that adopted him? He said something about "my son could have named him"? And his mother is mentioned. Do we know her? Maybe re-reading would clarify things.

(￣∇￣")thanks