Modern Family star Sarah Hyland, 20, takes Us Weekly behind the scenes of a special episode the hit ABC show (airing May 18 at 9 p.m. EST).

"It really feels like a family," the actress says of her costars (including Julie Bowen, Ed O'Neill, Ty Burrell, Jesse Tyler Ferguson, Sofia Vergara, Ariel Winter, Nolan Gould, Rico Rodriguez, Eric Stonestreet and Jaden and Ella Hiller).

In the May 18 episode, Alex Dunphy (played by Winter) takes center stage when she graduates from middle school. "She's a real teenager dealing with real teenager problems," Hyland says. "I like acting as an older sister to her."