Sibling drama gets a Chekhov twist in 'Vanya and Sonia and Masha and Spike'

What you get when you cross Christopher Durang with Anton Chekhov meets your best expectations from the king of anxious comedy and the master of Russian despair -- gloom and guffaws. Durang starts with Chekhov but runs every which way in "Vanya and Sonia and Masha and Spike." Greek tragedy? Walt Disney? Why not?