"With us, she genuinely is interested in our story," Christopher says. "And if not, she did a great job of faking it. She continues to care about what happens to me and my family. It's really been quite extraordinary."
Christopher has become one of Barbara's dearest friends and someone she's interviewed five times now. He had a special message for Barbara: "I want to thank you for the friendship that's grown so strong over the years of this journey. You're the best! You, too, Oprah!"