Sam is Lucy's younger sibling, confident and self-determined. Sam decides to live as male to capitalize on more opportunities, developing a clear identity and maintaining a close bond with their father.

Ba is Lucy and Sam's father, an American-born man of Chinese descent. A complex character, he is portrayed through evolving perspectives as both harsh and loving, with a complicated relationship to his cultural roots.

Ma is the wife of Ba and mother to Lucy and Sam. A native-born Chinese woman, she is initially seen as self-sacrificing but later revealed to be ambitious, driven by a desire for gold and a comfortable lifestyle.