ABC News(NEW YORK) -- They are a mother and daughter who consider each other best friends. And yet, Bernadette and her 14-year-old daughter, Taylor, who asked that 20/20 not reveal their last names, don't eat meals together, don't share any activities and don't even speak to each other. It's all because everyday sounds Bernadette makes -- clearing her throat or sighing -- can send Taylor to t...