The Canterbury Tales was written in a period where the Catholic Church sold extravagances. Individuals would give a proposing to the congregation and would get grace for a transgression or sins. The summoner for this situation was bad. He was able to give an extravagance or grace for a wrongdoing, in return for a quart of wine. His rationale was egotistical and just for his own pleasure.
Since family is a really big theme in this novel, there are many themes you can come up with but there's one in my mind. "Learning to live in peace and poverty isn't always a wise choice when it comes to abusive families." Idk if this might help
