When Lizzie Valverde graduated from Columbia University on Monday, she had two special supporters in the crowd: her long-lost sister and their birth mother. According to ABC News, Valverde, 35, and Katy Olson, 34, met two and a half years ago, on the first day of a writing class at Columbia. Both women already had a lot in common: they were returning to college in their 30s and both wanted to pursue their passion of writing. But that day, the women discovered something more — that they are sisters. Their Mom, Leslie Parker, was a teenager when she gave them up for adoption.