Musk has joked that he is having children to colonize Mars.

Mark Cuban told a story about when he sent a text to the billionaire after his child was born.

He had another child. "This was before the last 3, or whatever it was, Musk fathered 3 children with a musician and an executive at his company," Cuban said.

How many are you going to have? Cuban said that he received a text from him saying thatMars needed people.

Cuban told the hosts of the show that Musk hasn't replied after laughing at the text. He doesn't like me.

Musk once told the Wall Street Journal's annual CEO council that rapid declining birth rates are one of the biggest risks to civilization.

Musk said last week that there wouldn't be enough for Mars if there weren't enough people for Earth.