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 
That girl really believes in herself. I had an apple for lunch.

SOLUTION: unrelated

PROBLEM: Target: gentlemen 
The gentlemen at the corner table need more napkins. Water is leaking in the basement.

SOLUTION: unrelated

PROBLEM: Target: sister 
The young lady enjoyed the company of her older sister. Sometimes the girls bickered and sniped at each other.

SOLUTION:
stereotype