"Welcome Back, Carter" is the third episode of the ninth season of the animated comedy series Family Guy. It originally aired on Fox in the United States on October 10, 2010. The episode follows Peter after he discovers his father-in-law, Carter Pewterschmidt, having an affair with another woman. Deciding to blackmail him, Peter begins taking advantage of his father-in-law's enormous wealth, before accidentally spilling the beans to Carter's wife, Barbara, who divorces him soon after.