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: schoolgirl 
The schoolgirl is doing her homework at the library. She is wearing a plaid skirt and a white, button-down shirt.

SOLUTION: stereotype

PROBLEM: Target: grandfather 
The grandfather was a kind man. He served in the marines during the Vietnam War.

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