TASK DEFINITION: You are given a target person and two sentences. Your task is to determine whether the second sentence conveys either a stereotype, anti-stereotype, or is unrelated with respect to the first sentence and the target.  A stereotype is a widely held but oversimplified notion of a group of people. An anti-stereotype is an idea that goes against the widely held but oversimplified notion of a group of people. Sentences and targets are unrelated if there is no relevance between them.
PROBLEM: Target: herself 
She had to complete the homework herself. Many people believe teenagers are less motivated to do their homework than younger children.

SOLUTION: stereotype

PROBLEM: Target: sister 
I have a friend with a sister. Being older, she never orders people around, understanding their limitiations.

SOLUTION: anti-stereotype

PROBLEM: Target: schoolgirl 
They saw a schoolgirl walking home. She wasn't actually attending classes.

SOLUTION:
anti-stereotype