Played by: Reese Witherspoon
She’s married to Ed (Adam Scott), has two children—Abigail (Kathryn Newton) and Chloe (Darby Camp)—and insists she go by her full name: “Madeline Martha Mackenzie.” While her marriage might seem ideal, it’s not.
First, her ex-husband and the father of Abigail, Nathan (James Tupper), remarried a woman named Bonnie (Zoë Kravitz), and they have a daughter named Skye (Chloe Coleman), who just so happens to be in the same class as Chloe. And second, Madeline is having an extramarital affair with Joseph Bachman (Santiago Cabrera), who runs the local theatre company.
After several attempts to break it off, her infidelity threatens to reveal itself when Madeline and Joseph get in a car crash, ultimately prompting Ed to ask all the right questions.