YMMV / Family Guy S 9 E 15 Brothers And Sisters

• Harsher in Hindsight: Peter's despair at the thought of losing out on having a brother-in-law becomes this in "Peter's Sister", when it's revealed that he did have a sister (despite his claims otherwise) and she used to bully him relentlessly. With this in mind, it's no wonder that Peter reacted the way he did; Mayor West was the first sibling figure he shared a positive relationship with, and Lois ruined it.
• Informed Wrongness: Lois eventually realises she was wrong to stop Carol from going through with marrying Adam, even though the couple literally met, went on their first date, and got engaged seemingly within the span of just a few hours at least.