Superman - real or bluff?

Ian: Daddy, can we go and see Batman in Australia?
Me: Why?
Ian: San yi (3rd aunt) said Batman in Australia is real.
Me: No lah, it's just a man wearing Batman's costume.
Ian: Noooooo!! (in disbelief) San yi said it's real!
Me: Ian, do u believe san yi or daddy? San yi said it's real but daddy is now saying it's bluff.
Ian: (thought for awhile) San yi.
Me: Ian!

Ryan: But daddy, the Batman car is real
Me: It is also not real.
Ryan: But it can move!
Me: Can it fly?
Ryan: (thinking)
Me: My car can also move. I can also paint it like a batman's car.
Ryan: (He looks like he is beginning to understand)

Ian: No lah..it's real.

San yi, can you explain to Ian? He believes you.

But then again, should I kill his super hero fantasy?