Factual error: When Andy and Charlie have caught a cab (allegedly in Manhattan), and the agents are running after the car, we see green letters reading "Manor", which is a movie theater in Wilmington, NC. (00:03:19 - 03:26:00)
Other mistake: Vicky is murdered and her corpse pops out of the closet. She slowly opens her eyes despite being dead.
Answer: Charlie had nowhere else to go and trusted no-one. The Manders had previously taken in Charlie and her father, were kind, and, knowing the truth, did not exploit them and tried to protect them. Charlie needs a home and knows they will care for her.
raywest