Lilian has never felt embarrassed all her life than she was right now, he called her fake! An imposter!
What a total jerk!
Although she already has the hunch that Igor was going to be a strong force to reckon with, unlike Vladmir, but she didn't know that he will be this open. What if truly she's his sister and he gets to accuse her falsely?
It made Lilian anxious, no, anxious wasn't the right way to explain how she was feeling right now, but the most evident feature in her face which Sergie seem to notice was fear.
She shouldn't have come here with Lily, without Aunty Margaret, it's like she saw this coming when she said that they were going to need a DNA test, to prove that she's not an imposter.
Lily was the first to attack him. "How dare you say something like that to your sister?"