Stories have a way of changing faces. They are unruly things, undisciplined, given to delinquency and the throwing of erasers. This is why we must close them up into thick, solid books, so they cannot get out and cause trouble.
When a child asks you something, answer him, for goodness sake. But don't make a production of it. Children are children, but they can spot an evasion faster than adults, and evasion simply muddles 'em.