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.

After announcing that she has welcomed a baby with Elon Musk, Ashley St. Clair says, through her rep, that the SpaceX CEO has not yet acknowledged their child.