“One Drop,” a family drama with music by Andrea J. Fulton, brings to life the politics of a young mixed-race man’s “passing” for white in post-Civil War Louisiana, illustrating the risks taken by those not afraid to love despite bigotry. The piece, inspired by the playwright’s actual family history, tells the story of a family torn apart by racism but ultimately reunited. It debuted in Theater for the New City’s Dream Up Festival in 2010. TNC will present a revival of the play, directed by Sabura Rashid, from February 1 to 18 in honor of Black History Month.