" Of all her siblings, Gabriel was the one to whom Phoebe had always felt closest. In his company, she could make petty or sarcastic remarks, or confess her foolish mistakes, knowing he would never judge her harshly. They knew each other's faults and kept each other's secrets.
Many people, if not most, would have been flabbergasted to learn that Gabriel had any faults at all. All they saw was the remarkable male beauty and cool self-control of a man so elegantly mannered that it never would have occurred to anyone to call him a lunkhead. However, Gabriel could sometimes be arrogant and manipulative. Beneath his charming exterior, there was a steely core that made him ideally suited to oversee the array of Challon properties and businesses. Once he decided what was best for someone, he took every opportunity to push and goad until he had his way.
Therefore, Phoebe occasionally found it necessary to push back. After all, it was an older sister's responsibility to keep her younger brother from behaving like a domineering ass. "

― Lisa Kleypas , Devil's Daughter (The Ravenels, #5)