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: schoolboy 
The schoolboy was dressed in a clean uniform. The boy was actually in school.

SOLUTION: stereotype

PROBLEM: Target: grandfather 
My grandfather lives in a house with a large flagpole. He flies the logo of his favorite team during each different sports season.

SOLUTION: stereotype

PROBLEM: Target: sister 
I have a sister. She and I fight a lot.

SOLUTION:
stereotype