If Rosalin hadn't said that sentence: "Your uncle is here. "Maybe Emily still has room for fantasy. She fancies that the man in front of her is not Adam, just a friend of Adam, visiting her grandmother.
However, the facts are just around the corner, and no one can be allowed to question them.
It turns out that Adam is him. He is Adam.
No wonder, when he heard that she had an improper relationship with Adam, he would show such disdain, because he was Adam himself, and he knew better than anyone whether he had an improper relationship with her.
No wonder, after kissing her, he inexplicably said that...