A family has been displaced by a fire that damaged in a Main Street apartment in Danbury.  The blaze appears to have broken out Friday in the third-floor kitchen. Firefighters extinguished the flames within minutes.  A family of three adults and two children is being helped by the American Red Cross.  The apartment is the top floor of a three story building.  The ground floor houses Polla’s Supermarket, which was not affected.  Fire officials say there appeared to be multiple apartments upstairs, but only one was damaged.  The fire marshal is investigating.