Wonderful World by Richard Dresser

Max has a serious in-law problem. An apparently happy family hurtles to the brink of despair in this hilariously twisted comedy about two brothers, Max and Barry. Feeling slighted by Max and his girlfriend, Barry's wife embarks on a scorched-earth policy of truth-telling. Wonderful World probes the subterranean truths of an American family and ultimately affirms the mysterious and powerful bonds that hold a family together.