Mrs. Lee Yong Chien let out a gasp and clutched her purse tightly to her chest, as Astrid realized in astonishment that the two girls were Chloe and Delphine, Charlie Wu’s daughters. And the deranged-looking woman was none other than Charlie’s estranged wife, Isabel!
-- Narrator (Part 1, Chapter 2)

Importance: During a manic episode, Isabel took her daughters out of school and confronted Astrid for being the woman with whom Charlie was sleeping. People were shocked by Isabel’s appearance because they at first thought she was homeless because of the way she was dressed.

Eleanor sighed in frustration. ‘You’re wrong about that, Nicky. I know Ah Ma won’t close her eyes until she sees you one last time.
-- Eleanor (Part 1, Chapter 3)

Importance: Even though Nick says that he will not return to Tyersall Park, his mother tells him that she does not believe that Su Yi will allow herself to die until she sees Nick...