Grimes and Elon Musk Welcome Third Child Together, Nicknamed 'Tau'

Grimes confirmed on Twitter that she and Elon Musk have welcomed a third child together, nicknamed "Tau".
The news was first revealed in a New York Times book review about Musk before Grimes and Musk confirmed it themselves.
Musk also tweeted confirming the name "Tau Techno Mechanicus" for their third baby.
Grimes and Musk already have two other children together - X AE A-XII ("X") and Exa Dark Sideræl ("Y").
Musk also has 5 other children from previous relationships, while this is Grimes' third child.

billboard.com

Relevant topic timeline:

9/9/2023

New Biography Reveals Elon Musk Has Third Child Tau with Grimes, Split Remains Fluid

Elon Musk's biography confirms that he has a third child named Techno Mechanicus with his ex-partner Grimes, making his total number of children 10 with three different women.

9/11/2023

Grimes Confirms She and Musk Had Third Child in 2021, Wants Her Daughter to be Friends With His Twins With Neuralink Exec

Grimes has shared an update on their growing family, including the name of their baby daughter, Exa Dark Sideræl, and their previously unknown child, Techno Mechanicus, nicknamed Tau.