I can almost hear the great big cosmic laugh emanating from some metaphysical location.  The source of the laughter is gay-closeted, deceased The Brady Bunch patriarch, actor Robert Reed.  In addition to the guffaw, he’s giving his two eldest television sons a “thumbs way up.”  Barry Williams and Christopher Knight, brothers Greg and Peter Brady on The Brady Bunch, are together again, this time, playing a gay couple on the “Josh and Jeff” episode of Fox’s That ‘70s Show. Taped in January, the episode, in which the former Brady siblings share a screen kiss, is scheduled to air on April 27.  We know Robert Reed approves.  But what would Marcia say?