Final answer:
The attendance of the Grangerfords and Shepherdsons at church in Huck Finn is ironic due to their violent feud and hypocritical behavior.
Step-by-step explanation:
The Grangerfords' and Shepherdsons' attending church is ironic because they engage in violent feuding with each other, yet they both claim to be devoutly religious. Instead of following the teachings of love and peace preached in church, they continue their longstanding vendetta, which ultimately leads to tragedy. This irony highlights the hypocrisy and moral contradictions present in their society.