Shivon Zilis, the Neuralink executive who already has three children with Elon Musk, took to the billionaire’s preferred social media platform on Friday to announce that the pair had welcomed a fourth child into the world: Seldon Lycurgus.

Elon Musk and Shivon Zilis have welcomed their fourth child, a baby boy named Seldon Lycurgus. Zilis confirmed the birth in a social media post while celebrating their twins, Strider and Azure, on their second birthday.

Elon Musk’s ever-growing brood of children has expanded once again after he confirmed the arrival of a new son named Seldon Lycurgus. The baby is believed to be his 14th child and the fourth he has had with Shivon Zilis, a Canadian executive at Neuralink, his neurotechnology firm.