Junior tells PEOPLE that working with his Oscar-winning sister on the Shakespeare play in New York City has been "a dream come true"

Shakespeare In the Park has curated a top-tier cast for their free production of Twelfth Night. From now until September 13, you can catch Nyong'o, Oh, Jesse Tyler Ferguson, Peter Dinklage, and more stars sharing the same Central Park stage. Rumor has it, the 115-minute show spotlights a ruffled collar or two.

The siblings “really enjoyed make-believe” as kids. Now they are playing Shakespeare under the stars at the newly reopened Delacorte Theater in Central Park.