The Girl Next Door (2007)

In a quiet suburban town in the summer of 1958, two recently-orphaned sisters, Meg and disabled Susan, are placed in the care of their mentally-unstable Aunt Ruth. But Ruth's depraved sense of discipline leads to unspeakable acts of abuse and torture that involve her young sons, the neighborhood children, and one 12-year-old boy, David, whose life will be changed forever.