Jenna Bush Hager became an aunt to her twin sister, Barbara's newborn baby in September, she was over the moon and now she's opened up about her sibling's lengthy journey to motherhood and made a surprising revelation.Speaking to Hoda Kotb on her podcast, Making Space, Jenna, 39, spoke about how for many years people wondered why Barbara didn't have any children.MORE: Jenna Bush Hager divides fans with 'emotional' photos of her daughtersThe mom-of-three then explained that her twin had