While Ralph finally stands up for Kate and tells Mulberry to leave, Ralph also reveals his moral vacuity. He invited Kate to the party not because he wanted her there for the sake of her company but because he sought to use her to try and get an in with an especially alluring client. That shows that, unlike Nicholas, Ralph is not moved by feelings of loyalty toward his family. Instead, he is willing to lie to and exploit his family if it brings him closer to getting what he wants.