Who is Wang the Tiger's Wife Who Lives in the Coastal City from A House Divided and what is their importance?

Ai-lan's mother is the wife who lives in the coastal city. She is honest, comforting, and welcomes Yuan into her home when he runs away from his father. Over the course of the novel, the Wife who lives in a coastal city, cares for Yuan, provides for his education, and even assists in his release from prison. She treats Yuan as her own son.