Marlee Matlin will guest star tonight on the new show Switched at Birth. It premieres at 9p Eastern on ABC Family. Two families learn that their now teenage daughters were accidentally switched in a the hospital when they were born. One of the girls lost her hearing in childhood. Daphne, the hearing girl is confident and wealthy while Bay, the deaf girl, is neither. Her best friend is Emmett (played by Sean Berdy), who is also deaf and wants nothing to do with the hearing. Matlin will play his mother. Daphne is played by Katie Leclerc, who learned ASL in high school and then found out she had Meniere's disease at the age of 20. The inner-ear disorder left her with full hearing but lead her to explore Deaf Culture. The producers of the show said they tried to make sure they were accurate in the portrayal of Daphne on camera. Watch and let us know if you think they did or not. Find out more about the show here or watch the video below.