“Apologize to your mother. And stop making a scene!”
—Quan, in Book 5: Lodestar
Quan is described to have jet-black hair and silvery eyes, like his children, but no silver-tipped bangs.
He puts a huge emphasis on appearances. He does not want his reputation to be tarnished by his children, as they are twins, and so he tries to hide the truth from the public, is afraid of making a scene in public and feels ashamed of Tam when he draws unwanted attention. He also shows disapproval of Tam's silver bangs.
He firmly believes in children respecting their parents.
Quan doesn't like the fact that Tam is a twin and is harsh and disrespectful to him which makes him rude back to him.
Doesn't like the fact that she is a twin and is harsh but nicer to Linh than her brother because Tam is disrespectful and rude towards them and she isn't really.