Why Sammy doesn’t “fully” Chinese?

Dan, Rachel, Steven, Sammy, Nicole and Nai Nai – The whole family is reunited around a coffee table, and Dan Sun, the father, ready to say goodbye and leave for China. Meanwhile, there is a family secret that should have been revealed a long time ago. Dan Sun knows the truth, but is reluctant to tell everyone – after all, he is the protector of his family. The secret is made to be kept – that is, until he gets grandmother Nai Nai’s blessing.