Elon Musk has fathered his thirteenth child, author Ashley St. Clair announced on Friday, Feb. 14. She shared that they welcomed the child five months ago.

Musk's first wife, Justine Wilson, is a fantasy and sci-fi author with whom he had six children. Their first child, Nevada Alexander Musk, was born in 2002 but tragically died due to Sudden Infant Death Syndrome. The couple later had twins, Griffin and Vivian, in 2004, followed by triplets, Kai, Saxon and Damian, in 2006.