In this Judeo-Christian/new age fantasy by Tom Dudzick, who also wrote the semiautobiographical Over the Tavern, an uptight New Yorker brings his Jewish atheist fiancee home to his devout Catholic parents for Christmas. It seems your typical holiday angst fest until the mentally challenged younger brother begins channeling a supernatural being (who's apparently British), throwing everyone's beliefs into question. This much suspension of disbelief is a stretch, even at Christmastime. But as the parents, Denyse Leahy and Don DeCarl enliven and sweeten the play's surprising epiphany: he's a gruff marshmallow and she's a dingy wisewoman in the manner of Archie and Edith Bunker. And the show does supply an agreeable blend of chuckles, tingles, and "awww" moments. Through 12/18: Fri-Sat 8 PM, Sun 3 PM. Attic Playhouse, 410 Sheridan, Highwood, 847-433-2660. $18 in advance; $20 at the door.