This child spends most of her time with her mother and is held, cuddled, played with, and parented by dozens of other people. She's intelligent and curious, and she wasn't the least little bit scared of the strange man with the camera.          I think of the families I see in supermarkets and department stores and how refreshing it is to come upon a healthy family. It seems like most families have snarling adults and whiny, sulking children.          You don't see dysfunctional families on State Street. It's really true; you just don't see unhappy kids.