Elon Musk, the famous entrepreneur and CEO of companies SpaceX and Tesla Inc., is father to 11 𝘤𝘩𝘪𝘭𝘥ren. He posted on X, “Doing my best to help the underpopulation crisis. Population collapse due to low 𝐛𝐢𝐫𝐭𝐡 rates is a much bigger risk to civilization than global warming.”

Musk shares five 𝘤𝘩𝘪𝘭𝘥ren with his first wife, Justine Wilson. They had twins, Vivian Jenna and Griffin, who are now 19 years old. They also had triplets named Kai, Damian and Sax, 𝐛𝐨𝐫𝐧 in 2006. Their eldest son Nevada died at 10 weeks old.

In recent years, Musk’s family has expanded with his ex-girlfriend, the musician Grimes. In Musk’s new biography written by Walter Isaacson, it’s revealed that Musk and Grimes welcomed a third 𝘤𝘩𝘪𝘭𝘥. The 𝘤𝘩𝘪𝘭𝘥’s full name is Techno Mechanicus. He goes by the nickname Tau. They kept Tau’s existence private until now.

This follows the pattern they established with their second 𝘤𝘩𝘪𝘭𝘥 Exa Dark Sideræl Musk, who is called Y and was 𝐛𝐨𝐫𝐧 in 2022. Their first 𝘤𝘩𝘪𝘭𝘥 together X Æ A-12, or simply X, was 𝐛𝐨𝐫𝐧 in 2020.

Musk also volunteered to be a s.p.e.r.m donor for Shivon Zilis, an executive at his company Neuralink Corp. They used in vitro fertilization (IVF) to ensure that the 𝘤𝘩𝘪𝘭𝘥ren would have his genetic makeup. According to the biography, Musk expressed a desire for intelligent people to have 𝘤𝘩𝘪𝘭𝘥ren. Zilis had twins in 2021 at the same time Grimes was expecting their second 𝘤𝘩𝘪𝘭𝘥. Despite there being no romantic involvement according to Reuters, Musk reportedly didn’t tell Grimes about his involvement in the 𝐛𝐢𝐫𝐭𝐡 of Zilis’s twins.

The two mothers don’t appear to be on good terms. In a since-deleted post, Grimes alleged that Zilis had blocked her on X. She also claimed that Musk was keeping their son from her. “Tell Shivon to unblock me, and tell Elon to let me see my son or plz respond to my lawyer. I have never been allowed to see a photo of these 𝘤𝘩𝘪𝘭𝘥ren until this moment, despite the situation utterly ripping my family apart.”

There is also mention of a strained relationship between Musk and his daughter Vivian, who is transgender. Vivian petitioned the California court to recognize her new name and gender identity. Court documents indicate that she sought these changes because of her gender identity and her desire to distance herself from her biological father.