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.
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.
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