A new biography on the Tesla CEO's life, written by journalist Walter Isaason, will be released on Sept. 12
According to The New York Times’ review of Musk’s biography, which was written by journalist Walter Isaason and set to be released on Sept. 12, Musk, 52, and Grimes, 35 — whose real name is Claire Boucher — welcomed a third child, a son named Techno Mechanicus, who also goes by “Tau."
It is unclear if the Space X founder's forthcoming biography contains more details about the infant, including when or where he was born.
Representatives for both Musk and Grimes did not immediately respond to PEOPLE's request for comment.
In a March 2022 Vanity Fair interview revealing Exa Dark’s birth, Grimes admitted that the former couple wanted more babies, telling the outlet, "We've always wanted at least three or four."
But the day the article was released, the "Genesis" singer tweeted that the couple had broken up again.
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Alongside the three kids he shares with Grimes, Musk is also a father to the six children he shares with his ex-wife, Canadian author Justine Wilson.
Musk had his first son, Nevada Alexander, with Wilson in 2002, but at 10 weeks old he died from sudden infant death syndrome (SIDS).
The former pair then welcomed twins Vivian Jenna Wilson and Griffin. One of Musk's now 18-year-old twins has filed to legally change her name and gender and said she no longer wishes to be related to her father, according to court documents obtained by PEOPLE.
Wilson then gave birth to triplets named Kai, Saxon, and Damian in 2006, two years after having their twins.
Musk later secretly welcomed another set of twins, son Strider and daughter Azure, with Shivon Zilis in November 2021, according to court documents published by Insider on July 6. The twins were born in Austin, Texas — just weeks before he and Grimes welcomed their daughter together.
"I really care about having a very good relationship with my kids. I think I understand how to be a good parent to them. Both enforcing discipline and being their friend," she said. "Who knows, maybe they’ll resent me and reject family culture, but I feel like they will not."
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