In Wendy MacLeod’s grotesque little cartoon about brother-sister incest, the twisted sibs reenact the Kennedy assassination as foreplay, giving us plenty of time to notice other problems in the family dynamic left unaddressed by the author. And the secrets of the clan aren’t shocking. This Easy Street Players production is redeemed by the sympathetic performances of Matt Dyson as the forgotten younger brother and Aubrey Brown as the shunned fiancee. Through 8/24: Thu-Sat 8 PM, Sun 3 PM, Athenaeum Theatre, second-floor studio theater, 2936 N. Southport, 312-902-1500, $15-$17.