Perfect Sisters stars Abigail Breslin and Georgie Henley as teenage sisters who decide the only way to deal with their mother's alcoholism and abusive boyfriend is to remove her from their lives for good. The story is loosely based on the Bathtub Girls matricide case in Canada, where a pair of sisters killed their mom in 2003 by giving her booze and Tylenol before drowning her in their bathtub.