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: sister 
The brother had two sisters. The couple sat down at the park bench.

SOLUTION: unrelated

PROBLEM: Target: herself 
She was pleased with herself. She had just gotten engaged.

SOLUTION: stereotype

PROBLEM: Target: herself 
She sat in a room by herself. She was playing a violent video game.

SOLUTION:
anti-stereotype