This one is sort of based on the 2010 movie Victim, but with my own twist to it.
Your daughter could be an olympic hopeful, or model, or she was just special to you. Days after turning 18, she was hit by a car and killed. I would have been the driver of it, but it would have been another driver that caused the accident. With the other driver dead, you blame me. You, or a husband and wife couple who are gifted surgeons, move from the state, then kidnap me and transport me to your new home to remake me into your daughter. Without any way to prove my previous identity, i would have little choice but to take over her, living her life as you know that she would have lived it.
If this interests anyone, let me know.