I realize your post is a dozen years old but I was just looking over the Morris Super family today.
I'm trying to discover William Christian Super's family. I don't know if he was the son of Morris, nor do I know where William was born. The son of Morris is the closest fit, but not sure if he's the right guy.
Morris Super died in October 1966, in New York, age 74 years.
William Christopher Super in question was a psychiatrist, and had several wives and children. He lived in New Orleans for many years, and died in Arizona. Does this sound like your William?