Elon Musk Speaks Out After Welcoming Twins: 'Doing My Best to Help the Underpopulation Crisis'

Elon Musk and Shivon Zilis, the project director at his Neuralink company, secretly welcomed twins in November 2021, court documents reveal

Elon Musk is speaking out after a report this week revealed that he fathered twins with Neuralink executive Shivon Zilis last November.

On Thursday, one day after Insider published court documents that revealed Musk and Zilis secretly welcomed twins together, the Tesla CEO, 51, seemingly alluded to the baby news in a tweet about the "underpopulation crisis."

"Doing my best to help the underpopulation crisis. A collapsing birth rate is the biggest danger civilization faces by far," he wrote.

Adding in follow-up tweets, Elon wrote, "Mark my words, they are sadly true" and "I hope you have big families and congrats to those who already do!"

According to the court documents, the twins were born in Austin, Texas. The papers reveal that in April, Musk and Zilis –– who is the project director at his Neuralink company –– asked a Texan county court to change their babies' names so they would "have their father's last name and contain their mother's last name as part of their middle name."

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Elon Musk arrives at The 2022 Met Gala Celebrating "In America: An Anthology of Fashion" at The Metropolitan Museum of Art on May 02, 2022 in New York City. (Photo by Kevin Mazur/MG22/Getty Images for The Met Museum/Vogue ); Shivon Zilis http://www.shivonzilis.com/
Kevin Mazur/MG22/Getty; Shivon Zilis/shivonzilis.com

The twins' sexes were not made public and their names were redacted from the documents.

An Austin judge granted their request in May, per Insider.

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A representative for Musk did not immediately respond to PEOPLE's request for comment. Zilis also did not immediately respond.

BEVERLY HILLS, CA - FEBRUARY 26: SpaceX CEO Elon Musk attends the 2017 Vanity Fair Oscar Party hosted by Graydon Carter at Wallis Annenberg Center for the Performing Arts on February 26, 2017 in Beverly Hills, California. (Photo by Pascal Le Segretain/Getty Images)
Elon Musk. Pascal Le Segretain/Getty

The twins' arrival came just weeks before Musk and his former partner Grimes welcomed a baby girl via a surrogate in December, despite the pair splitting up in September. She revealed the birth of Exa Dark Sideræl, who they've nicknamed Y, in a cover story for Vanity Fair. They also share 2-year-old son X Æ A-12.

After welcoming the twins, Musk is now a father of 10. He shares 18-year-old twins Vivian Jenna Wilson and Griffin Musk, along with triplets Kai, Damian, and Sax Musk, who were born in 2006, with his first wife, Justine Wilson. The two had another son, Nevada Musk, who died at 10 weeks.

Elon Musk
Elon Musk with son X. Theo Wargo/Getty

Musk does not often discuss his own family, but he does have strong opinions on increasing the birth rate — stating that there are "not enough people" in the world at Wall Street Journal's annual CEO Council in December 2021.

"I think one of the biggest risks to civilization is the low birth rate and the rapidly declining birthrate," he said. "Please look at the numbers –– if people don't have more children, civilization is going to crumble, mark my words."

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