In the quiet town of Brookhaven, Mia Thompson has always been the protector. At just eighteen, she juggles the responsibilities of sisterhood and adulthood after the tragic loss of their parents, ensuring that her five-year-old sister, Lily, never feels the weight of their family's past. But when Lily expresses a heartfelt desire to have a brother, Mia's world is turned upside down. Enter Ethan Cross-the charming, infuriating heir of the rival family that has feuded with the Thompsons for generations. Their paths cross more than ever, igniting a tension that neither can ignore. As Mia tries to shield Lily from the animosity that has defined their families, she finds herself drawn to the one person she's been taught to despise. But when Lily's innocent request forces Mia and Ethan into an unexpected alliance, both must confront the deep-seated hatred that has shaped their lives. As secrets unravel and old wounds resurface, Mia and Ethan must decide if love can truly bloom in the shadow of rivalry. "A Sister's Request" is a heartfelt enemies-to-lovers story that explores the complexities of family, forgiveness, and the power of unexpected connections.