My sister is a bank teller she says it is a real tough job
Bank teller
A bank teller (often abbreviated to simply teller) is an employee of a bank who deals directly with customers. In some places, this employee is known as a cashier or customer representative. Most teller jobs require experience with handling cash and a high school diploma. Most banks provide on-the-job training.
Tellers are considered a "front line" in the banking business because they are typically the first people a customer sees at the bank.
Responsibilities and Duties of the Bank Teller.
is pretty far into the movie. Now it is true that she also says "she's my sister *and* my daughter" at the end of the beating, but that's a reveal, not on the nose writing. And even that reveal does not explicitly state the implications Nicholson now finally grasps, because those implications - much bigger than just a single isolated act of incest - are also not explicitly stated. "My father and I... understand? Or is it too tough for you?".