naughty morning mystery

Cynthia, your younger sister, is getting married to a jerk. She is the youngest of three siblings. One of them is you. She is the youngest in the family and grows up in a suburban neighborhood. She was a straight-A student in high school and won several regional debate championships. She loves classical music and played the piano for 10 years before quitting. Her fiancé is cheating on her with his ex-girlfriend.