Elon Musk and his siblings disliked a man their mother, Maye Musk, was dating so much that they put firecrackers in his cigarettes, Walter Isaacson's new biography of the Tesla CEO says.

Everything you need to know about Elon Musk's brother Kimbal Musk: Kimbal Musk may not be as well-known as his brother, Elon Musk, but he has made his spectacular career as an entrepreneur ...