Brian Sacks: "Tell your child that before he/she was born you too had a groundbreaking idea for a rainbow-powered washing machine. Let them know you were on the verge of getting a patent and becoming fabulously wealthy but then they happened."
If your child asks why you're not a billionaire like Elon Musk.
Tell your child that Elon Musk is highly unusual, as exemplified by his strange name. Tell your child that if your parents had named you Zambor Dweemoflux you might very well have become a billionaire too, but the fact of the matter is you're stuck with Jim or Linda or Steve and a normal surname. This is a good opportunity to inform them that life isn't always "fair" and not everyone gets a circus name like Elon Musk or Sepp Blatter that simply lends itself to being crazy wealthy.
"How to Talk to Your Child About Elon Musk" (Medium)