Nathan and his sister, Debbie, are upset when their parents announce they’re divorcing after 43 years of marriage. However, that’s nothing compared to the panic they feel when Carol, their intrusive mother, announces that she’s moving in with Nathan, while Tom, their easily distracted father, is moving in with Debbie.
When Carol dictates that it’s time to rearrange the family’s positions in the Millers cemetery plot because of the two divorces, Nathan needs to approach his ex-wife, Janice, to ask her to sign back her space to the family.
It's Halloween, and Nathan, Debbie and Adam take Mikayla trick-or-treating to the house of an old woman who everyone in the neighborhood thinks is a witch. Meanwhile, Nathan and Debbie are furious when they discover Carol lied about what really happened to their pet parrot they thought flew away when they were kids.
Nathan hatches a plan to get his parents back together by showing them all of their sentimental family possessions in the hopes it will make them remember the good times they've had.
When Carol finds out that Tom never had “the talk” with Nathan about the birds and the bees, she insists it’s not too late to gather the family together and do it now.
When Nathan helps Carol set up her profile on an Internet dating site, he and Ray get so excited about one of her potential suitors, they start corresponding with him, pretending to be Carol.
When Nathan learns why Debbie is Tom’s favorite child instead of him, he decides it’s time to fill his parents in on some of Debbie’s childhood secrets.
When Carol's overbearing mother and father announce they’re coming to visit for Christmas, Carol recruits Nate and Tom to cover up their failed relationships and present a happy facade. However, Nate begins to believe the lie, and considers getting back together with his ex, Janice.
Nathan learns to appreciate Carol’s incessant rants after he mimics one of them at work and is rewarded with his own news segment to complain on the air. But when his tirades lack the flair and fervor of his mother’s, he secretly devises ways to keep her irritated in order to get new material.
When Nathan gets frustrated after he's forced to drive Carol around town for errands once again, he demands that she either learn how to drive or find another chauffeur. But when Debbie volunteers Adam to drive Carol, everyone's surprised when they form an unexpected bond.
Nathan asks Tom to spend the weekend with him in the hopes of finding something they have in common. Also, while Debbie and Adam are out of town at a vegetarian convention, Carol stays with Mikayla and accidentally turns her upraising upside-down.
Just as Nathan begins to unwind on his vacation in the Bahamas, Carol's surprise appearance gets him riled up all over again until they meet Ganja Pete. Meanwhile, Debbie is upset with Adam when she learns that he used to write love songs for the special girls in his life when he was younger
Nathan's excitement at scoring a ticket for himself and a guest to a dinner with President Obama turns to dread when he has to pick one of his family members to be his "plus one".
Nathan gets more than he bargained for when he befriends a hapless coworker. Meanwhile, Tom and Adam argue over who is smarter and take an online test to settle the matter.
Nathan tries to hide his relationship with his mother's dentist, who angered Carol with a $75 charge for being late to an appointment; Tom keeps waking up with gum in his hair.
When Tom proudly tells the family he's dating a much younger woman, Nathan goes undercover to spy on him and make sure his father isn't being scammed by a gold digger.
