It is clear that Quan loves his wife Mai very much, from the way he reaches for her, cradles her hand and angrily tells Tam to apologize to Mai when Tam jerked free of her hold.
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.