Black Sheep

There are a number of plays called Black Sheep.

Black Sheep by Edmund Yates (185*)

Originally published as the novel Black Sheep (1867) and adapted for the stage as Black Sheep in 1868, by Yates and **.

http://www.bartleby.com/library/readersdigest/255.html

http://victorianfictionresearchguides.org/edmund-yates/

Black Sheep by Elmer Rice (1932)

A comedy in three acts that opened at the Morosco Theatre in New York City Oct 13, 1932 and played through Oct 1932, directed and produced by Rice.

https://www.ibdb.com/broadway-production/black-sheep-11645

Black Sheep by Lee Blessing (2001)

After a public reading at the Arena Stage in Washington D.C. October 19-27, 2001, it formally opened at the Florida Stage in Manalapan, Florida in December 14 of the same year.

https://en.wikipedia.org/wiki/Black_Sheep_(play)