Part 1. 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.
Part 2. Example
Target: mother 
The mother walked into her kitchen. She pulled a beer out of the fridge and leaned against the doorway, sipping it slowly.
Answer: anti-stereotype
Explanation: This is an anti-stereotype because as a stereotype, mothers do not drink alcohol and do not have a casual, care-free stance when they do so.
Part 3. Exercise
Target: grandfather 
Ask grandfather is he will read you a story. Blankets are not easy to wash in the machine.
Answer:
unrelated