Still, the twins say reading their mother's book has taught them so much more about their mother. "I was just surprised how candid she was because she's a really private person. In fact, we didn't learn many of these things until we read the book," Jenna says. "Some of the things, like the car accident, she didn't tell us until we were almost 18, I think."
Barbara says reading the book has been an emotional experience. "It's just been so much fun to read about my mom's life and read about her growing up and getting to know our great-grandparents that we never had an opportunity to meet," she says. "It's been a very great gift for us."
Tour the Bush family's Crawford, Texas, retreat