Once Charlie (Jennifer Lopez) realizes that Viola (Jane Fonda) is faking illness and being annoying on purpose, she pulls some fast ones herself and they have a showdown. On the wedding day Viola's ex-mother-in-law shows up and they bicker. Charlie realizes that her feud with Viola will go on the rest of their lives and decides to call off the wedding. Viola, realizing her son is happy and Charlie isn't so bad after all, reconciles and everything goes off without a hitch, with the Monster-In-Law being truly nice and not fakey nice. Clueless hubby-to-be has no idea that any of this bickering went on.
Thanks, Lisa E!

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