This is
It Might Have Been by Ray Reynolds.
New quote:
"How much do you see Superman?" repeated Brad.
"Does he ever come to dinner?" added Lisa.
"Come to dinner!" I said. "Superman! No! He never comes to dinner."
"Why not?" asked Lisa. "Doesn't he eat?"
"Yes--well, I don't know. I guess he eats, like anybody else does. But how should I know? I've never seen him."
"You've never seen Superman?" asked Lisa with round eyes. Brad was staring at me and even Mrs. and Mr. Green stopped chewing so they could listen to my answer.
"No! Why? Have you?"
"No, of course not!" said Lisa. "But you must have seen him sometime! Your parents are such good friends of his!" I could only look at her as if she had lost her mind.
