When Mayor West marries Lois' sister, Carol, they move into the Griffin's house to be one big "happy" family. To make room for everyone, Stewie is bumped out of his room and takes over Chris' room, but not everyone is annoyed by the change. Peter and Mayor West bond and become best friends.

When Bonnie and Lois take a trip to Paris, Bonnie crosses the line while in the City of Love. Meanwhile, Peter homeschools Chris and Meg using some unorthodox teaching methods.