While Regina has been away at rehab, Daphne has grown closer to the Kennish family, spending her days at their country club and her nights in their guest room. This new family dynamic does not sit well with Regina, who unexpectedly returns home early in hopes of spending more time with Daphne. Bay begrudgingly starts working at her dad's office and, when her car breaks down near a local carnival, runs into her ex-boyfriend, Ty (guest star Blair Redford, "The Lying Game"), who has returned from serving in Afghanistan. Meanwhile, Travis talks Emmett into bringing some girls over to the house while Melody is out of town, and Kathryn's elaborate ideas for Toby and Nikki's rehearsal dinner rubs Nikki the wrong way.
Switched at Birth tells the story of two teenage girls who discover they were accidentally switched as newborns in the hospital. Bay Kennish grew up in a wealthy family with two parents and a brother, while Daphne Vasquez, who lost her hearing at an early age due to a case of meningitis, grew up with a single mother in a poor neighborhood. Things come to a dramatic head when both families meet and struggle to learn how to live together for the sake of the girls.