robert mapplethorpe, a photographer who took pictures like these. tirred controversy with images, some pornographic that we can't show you. but you've probably never heard of this mapplethorpe, robert's younger brother, photographer, edward mapplethorpe. >> i took no interest in being a baby photographer. >> but he does take baby pictures, hundreds of them, in fact. and full disclosure, that's my little girl haming it up for the cam ra. >> this is just one part of an extensive range of edward's work that has had very little exposure, ask that has much to do with sibling rivalry. >> we grew up in a very suburban middle class neighborhood. we had a great childhood. >> in the 1980s, robert mapplethorpe became a prominent figure in a new york city subculture of artists and performers. a recently released hbo documentary called look at the pictures tells the story of his life through the eyes of those who knew him best, including edward, who grew up idolizing his mysterious and exciting older brother. >> i can say i was his earliest fan. he would come hom