Reborn as My Brother's Daughter

Siblings time-travel to ancient times, becoming a destitute father and daughter. Sophia Stark is the daughter, Justin Stark the father, failing exams. Uncle's family exploits, Lord Warner causes trouble, and people plot against Justin's Imperial Examination. Sophia uses modern skills: tea-frying, Silk Flowers, martial arts, and scientific mindset to help Justin with exams. They earn money, lead their clan, confront relatives, fight merchants, foil conspiracies, and protect 'Dad's' studies.