Anderson Cooper and Gloria Vanderbilt share their bond

Gloria Vanderbilt has been within the public eye since she was born, however in response to her son, CNN anchor and “60 Minutes” correspondent Anderson Cooper, the world has by no means gotten to see the aspect she’s shared with him. Of their new ebook, “The Rainbow Comes and Goes,” and an HBO documentary, “Nothing Left Unsaid,” each discover the loving and infrequently bickering relationship between mom and son. Rita Braver reviews.