Gloria Vanderbilt has been in the public eye since she was born, but according to her son, CNN anchor and "60 Minutes" correspondent Anderson Cooper, the world has never gotten to see the side she's shared with him. In their new book, "The Rainbow Comes and Goes," and an HBO documentary, "Nothing Left Unsaid," both explore the loving and occasionally bickering relationship between mother and son. Rita Braver reports. Originally broadcast April 3, 2016.