When Liliana discussed exposing the truth with Talia, Old Master Ding and Former Patriarch Ding, she chose not to randomly bring up the matter. She would wait for something to trigger her first.
And, according to how hostile Deanna was always to her, Liliana was certain the chance would come to her before the banquet ended.
For example, right at this time.
Liliana turned her body to properly face Deanna. Without stepping away from where she stood, she asked, "All this time, you really think my mother is a mistress, right?"
Deanna shrugged, her confidence was a mask of her foolishness.
"What else should I call her? She's a mistress who gave birth to you, a bastard child. Even though she's Old Master Ding's long-lost niece, she's still a mistress."