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. Eliza Coupe guest stars as Janice, Nathan's ex-wife.

Nathan and Debbie trade parents when they each think the other sibling has it easier.

When Carol finds out that Nathan is seeing a therapist, she secretly makes an appointment for herself in order to find out what's going on.

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.