After hearing her sister's supportive words, Mackenzie says she's incredibly grateful. "Chy, you spoke so beautifully about Dad's heart and about your truth and about your faith. I couldn't love you more right now," she says. "I totally agree that it's turned out to be much more explosive than I could ever have imagined, and I'm really sorry, Chy, to put you in this position. But I don't regret writing the book, because I really believe it's going to be a great help for a lot of people and it's going to help me."