The Fake Bride Is a Princess

My husband. "Vivian is the real legitimate daughter of the Sutton family. I can only marry Vivian. Demoting Claire to a noble concubine will suffice." My sister, Vivian. "It would be a fine story for my sister and I to serve the same husband." The Matriarch gives me a disdainful glance. They see me, an impostor daughter. Since the fake daughter and fake heir are involved, I, the emperor's real daughter, should grant them their wish.