Final answer:
The character with a husband named Clyde and a son named Horace, who ends up being unable to stone Tessie, is Tessie Hutchinson from Shirley Jackson's "The Lottery."
Step-by-step explanation:
The character you are asking about, whose husband Clyde broke his knee and who has a son named Horace, is none other than number 4) Tessie.
In Shirley Jackson's short story "The Lottery," Tessie Hutchinson is the woman who draws the marked paper for her family, and at the story's climax, she cannot catch up to Delacroix to stone her. Tessie is ultimately the unfortunate character who ends up as the victim of the town's brutal tradition.