The Bush twins just went on The Tonight Show with Jimmy Fallon to talk about their book. Barbara said they talked about writing a childrens book for "several years," but they finally decided to do it after trying to get Jennas daughter Mila excited about the birth of Jennas second child, Poppy.
"We told her all these fun stories that we used to do," Barbara said. "And we got excited thinking about a childrens book about how having a sister has made us braver than we ever thought possible, and its made our lives so much bigger and better to have a partner to go through life with."
Jenna chimed in that the book isn't inspired by their own experiences, but is ultimately about "sisterhood," which she added can apply to friends and colleagues, too.
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Watch Jenna and Barbara's full interview with Jimmy:
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