When Jenna Bush Hager received a midnight text from her twin sister, Barbara Pierce Bush, saying her baby was coming—six weeks early—she immediately burst into tears. “I started bawling,” Jenna told PEOPLE. “I was supposed to stay calm, but I just couldn’t.” What followed was a whirlwind of emotion, panic, and an unforgettable Target run that proved how powerful sisterhood can be.

On September 27, 2021, Barbara and her husband Craig Coyne welcomed their daughter, Cora Georgia Coyne, in Portland, Maine—far from their home in New York. The baby’s early arrival meant there was no nursery, no car seat, and not even a pack of diapers ready. But the moment Jenna heard the news, she hopped on a plane to Maine, determined to help her sister through the chaos.

“The next day after Cora was born, Jenna flew to Maine and helped us,” Barbara recalled. “She went to Target and did a big run. We didn’t have a thing.” From diapers to bottles to baby blankets, Jenna filled shopping carts with everything her sister might need. “She just handled it,” Barbara said. “It was the most Jenna thing ever—loving, a little chaotic, but exactly what I needed.”

Baby Cora, though premature, was strong. She spent her first few weeks in the Barbara Bush Children’s Hospital, named after her late great-grandmother, the former First Lady. For Barbara, it felt like divine intervention. “It was incredible,” she said. “In many ways, it felt like my grandmother was watching over us.”

As the twins adjusted to this new chapter, Jenna said she saw her sister through “completely different eyes.” “She hasn’t needed any advice,” Jenna admitted. “Watching her fall in love with her daughter has been so beautiful. And now I get to be an aunt—it’s the best.”

The Bush sisters’ bond has always been unshakable, and it continues to inspire their work. Their children’s book, The Superpower Sisterhood, celebrates the strength and connection between girls who lift each other up. “So many people tell us, ‘I wish I had a sister like you two,’” Jenna said. “We wanted to show that sisterhood can come in many forms—through friends, community, and love.”

Both women dedicated the book to their daughters, hoping the next generation of Bush girls will share the same closeness. “To our daughters,” the sisters wrote, “may you use your powers to empower others.”

Jenna’s three kids—Mila, Poppy, and Hal—have already fallen in love with baby Cora. “They’re obsessed,” Jenna said, smiling. “Hal prays for baby Cora every single night.”

From an unexpected delivery in Maine to a Target aisle filled with baby essentials, the story of Cora’s arrival is one that perfectly captures the Bush sisters’ lifelong bond: loyal, loving, and always ready to show up—no matter how early the call comes.