According to Insider, Elon Musk was married to Shivon Zilis in November. He was the director of operations and special project at Neuralink.

According to redacted legal documents, Musk, 41, and Zilis (36), filed court documents asking for their children’s names be changed to include Musk. Insider reported that the petition requested that their names include their father’s name and their mother’s maiden name.

The twins were born just before Musk’s second child, Grimes’ second child. Grimes was pregnant with Exa Dark Siderael Musk through surrogate in December. Musk, the world’s richest person, is the father of 10 children. He also has more than $200 billion in wealth. In May, he tweeted that the U.S. has had a “below min sustainable level for 50years.”

CBS MoneyWatch reached out to Tesla and Neuralink but they did not immediately reply. Musk tweeted on Thursday morning that he was “Doing all I can to help the underpopulation crise” and that the “collapsing fertility rate is the greatest danger that civilization faces.”

I am doing my best to address the underpopulation crisis. The greatest danger to civilization is a collapsing fertility rate.

Musk also tweeted, “I wish you have big families, and congrats for those who do!”

According to her LinkedIn page, Zilis is a Yale graduate who joined Neuralink in 2017. Zilis is also a fellow at Creative Destruction Lab. She describes it as a machine-learning incubator at the University of Toronto.

Musk was blessed with six children by Justine Wilson (Canadian author), who was also married to Musk between 2000 and 2008. Wilson wrote in Marie Claire that their first child, who was only 10 weeks old, died from Sudden Infant Death Syndrome (or SIDS) when he was 10. They had twins, then triplets.

One of the twins filed a petition to legally change their names and gender to Vivian Jenna Wilson earlier this year. Vivian stated in court papers that she “no more lives[s] with nor wishes to be related to [her biological father] in any way, shape, or form”.

Musk has also had two children with musician Grimes. Their first child, a boy called XAE A-12, was born March 2020. The second was born December 2018, just weeks after their twins Zilis and Zilis were born.