Final answer:
The sentence is using an allusion to Chicken Little, suggesting that the speaker's grandfather is overreacting or making a big deal out of a minor situation.
Step-by-step explanation:
The sentence is using an allusion to Chicken Little. In the story, Chicken Little is a character who panics and spreads alarming news of imminent disaster when an acorn falls on his head, believing that the sky is falling. Therefore, in the given sentence, the allusion to Chicken Little suggests that the grandfather is overreacting or making a big deal out of a minor situation, much like Chicken Little did in the story.
Learn more about Allusion in a sentence